Acta Oto-Laryngologica

Article	Citations
Static cervico-ocular reflex in healthy humans	34
Risk factors for local recurrence of early bilateral vocal cord carcinoma treated with transoral CO2 laser microsurgery	25
Correlation between subjective and objective measures in bilateral vestibulopathy	16
Mucin receptors in chronic rhinosinusitis with nasal polyps	15
Tracheotomy as a predictor of remission and demise for juvenile-onset recurrent respiratory papillomatosis	15
Canalplasty using underwater bone drilling in transcanal endoscopic myringoplasty for patients with a narrow external auditory canal	14
Possible complications of frontal sinus fractures after conservative or surgical treatment: retrospective study	13
Translation and linguistic validation of the Glasgow Benefit Inventory into Danish	13
The effect of caffeic acid phenethyl ester on facial nerve regeneration	11
Leveraging eCAP thresholds in a logistic model to predict speech outcomes after implantation in anomalous cochlea	11
Effect of basic-fibroblast growth factor on tympanic membrane perforation in a mouse model of blast injury	10
Correlation of polysomnography data and inflammatory markers after sleep surgery	10
Is tooth conservation possible in odontogenic sinusitis? Prospective evaluation of affected teeth condition-based protocol	9
Predictors of uvulopalatopharyngoplasty outcomes in patients with supine predominant positional obstructive sleep apnea: a prospective observational study	9
The critical period for development of secondary restenosis following post-intubation tracheal stenosis surgery	9
Narrow-band imaging combined with salivary pepsin to diagnose patients with laryngopharyngeal reflux	9
Predictive factors for malignant neoplasms veiled in deep neck infections	9
Management and outcome of adenoid cystic carcinoma of the major salivary glands: the 22-year experience of a single institution	8
Oncological and functional outcomes of partial or total laryngopharyngectomy for hypopharyngeal cancer with thyroid or cricoid cartilage invasion	8
The effect of COVID-19 on nasal mucociliary clearance	8
Identification of a novel DFNA5 mutation, IVS7-2 a > G, in a Chinese family with non-syndromic sensorineural hearing loss	8
Efficacy of endoscopic porcine small intestinal submucosa graft myringoplasty: a retrospective comparative study	8
Evaluating tooth extraction as a stand-alone treatment for odontogenic sinusitis	7
Magnetic resonance imaging of endolymphatic hydrops in patients with unilateral Meniere’s disease: a comparison between with and without herniation into the posterior and lateral semi-circular canals	7
Otolaryngologic manifestations of Mpox: the Atlanta outbreak	6

Correlation between grading methods of the cochlear endolymphatic hydrops and hearing loss in meniere’s disease using three-dimensional real inversion recovery sequences	6
Inflammation and malnutrition as markers of poor outcomes in head and neck cancer patients treated with nivolumab	6
The timing and methods for detection of recurrence in patients with head and neck cancer	6
Pure tone audiometry is a new method for evaluating congenital malformation of the middle and outer ear (CMMOE)	6
miR-34a predicts the prognosis of advanced-stage external auditory canal squamous cell carcinoma	6
Cochlear implantation for post-meningitis deafness with cochlear ossification: diagnosis and surgical strategy	6
Temporal processing, spectral processing, and speech perception in noise abilities among individuals with chronic kidney disease undergoing hemodialysis	6
Evaluation of vestibular functions in patients with obstructive sleep apnea syndrome	6
The significance of masking for the poor hearing ear in pure tone audiometry	6
Development of clinical predictive nomograms for prognosis of idiopathic sudden sensorineural hearing loss	6
Optimizing the efficiency of ECAP measurements due to interpolation	6
Cerebellopontine angle tumor presenting as acute audiovestibular syndrome	6
‘A study of correlations between sleep recording data and three sleep questionnaires: Epworth, Pittsburgh, Berlin’	6
Diagnostic approach to patients at risk of otogenic skull base osteomyelitis	6
Computed tomographic 3D analysis of the cochlear aqueduct—potential and limitations of clinical imaging	6
Congenital ear malformation (CEM)	6
Radiological classification of the mastoid portion of the facial nerve: impact on the surgical accessibility of the round window in cochlear implantation	6
Low-sodium diet with adequate water intake improved the clinical efficacy in Ménière’s disease	5
Thulium laser in stapedotomy surgery	5
Clinical manifestations and genetic analysis of a family with neurofibromatosis type 2	5
Volume ratio and distribution rate in patients with orthostatic vertigo/dizziness using MR imaging: a comparison with vertiginous diseases	5
Scopolamine for patients with motion sickness: a systematic review and meta-analysis with trial sequential analysis	5
Complications in lymph node excision in the head and neck area	5
Human papilloma virus (HPV) vaccination is associated with reduced number of surgical treatments, an observational study on recurrent respiratory papillomatosis in Northern Sweden	5
Relative contributions of radiation and cisplatin-based chemotherapy to sensorineural hearing loss in head-and-neck cancer patients	5
Subjective Visual Vertical test with the 3D virtual reality system: effective factors and cybersickness	5
12-month effect of middle ear pressure therapy with the EFET01 device for intractable definite Meniere’s disease and delayed endolymphatic hydrops after certification by the public health insurance sy	5
The effects of continuous administration of diazepam on the recovery of lesion-induced nystagmus in unilaterally labyrinthectomised rats	5
Association of plasma atherogenic index with the severity and prognosis of Bell’s palsy	5
Surgical treatment of T2-3 posterior hypopharyngeal carcinoma with preservation of laryngeal function	5
Allogeneic composite amniotic membrane in tympanic membrane repair: a randomized parallel controlled study	4
Clinical characteristics and repositioning efficacy analysis of posterior canal-benign paroxysmal positional vertigo-canalolithiasis and vertigo-cupulolithiasis patients	4
Transmastoid superior semicircular canal dehiscence plugging: VHIT findings	4
Trends in upper respiratory tract infections and antibiotic prescriptions during the COVID-19 pandemic – a national observational study	4
Danish translation of the Neck Dissection Impairment Index	4
Application of inner ear MRI after intravenous gadolinium injection in SSNHL	4
Expression of AQP-10, -11 and -12 in the rat stria vascularis	4
Effects of lesions of the organ of corti on hearing	4
HO-1: a new marker for predicting postoperative recurrence of CRSwNP	4
Does COVID-19 have an impact on hearing?	4
Post-surgical changes in wideband absorbance in paediatric cochlear implant users after mastoidectomy and posterior tympanotomy	4
Presurgical platelet–lymphocyte ratio for prognosis in advanced hypopharyngeal squamous cell carcinoma in individuals undergoing radical resection	4
Extent of abscess development in cervical abscesses and pathogenic bacteria related to swallowing function	4
Prevalence of cystic metastases in a consecutive cohort of surgically removed branchial cleft cysts	4
Current aspects of the quality of head and neck cancer care – survey of the Scandinavian Society for Head and Neck Oncology	4
Changes in serum lactate dehydrogenase as a prognostic factor in patients with head and neck squamous cell carcinoma treated with immune checkpoint inhibitors	4
Treatment outcomes in patients with supraglottic laryngeal cancer: a single centre study	4
Correlating intraepithelial papillary capillary loops of vocal cord leukoplakia with histopathology	4
Magnetic resonance imaging of the endolymphatic space in patients with benign paroxysmal positional vertigo: volume ratio and distribution rate of the endolymphatic space	4
Ototoxic effects of unilateral postauricular neomycin administration on the inner ears of Guinea pigs	4

Case-control study of otoconia proteins otolin-1 and otoconin-90 in patients with Meniere’s disease	4
Cervical vestibular evoked myogenic potentials and video head impulse test studies: alternative methods for detecting brainstem involvement in multiple sclerosis	4
A nationwide epidemiologic, clinical, genetic study of Usher syndrome in Japan	4
Epiglottic retraction is useful in diagnosis of exercise-induced laryngeal obstruction	4
The effect of screen time on hearing and balance in 6–16 aged children	4
Cochlear implantation in patients with Streptococcus suis meningitis: clinical characteristics and postoperative evaluation	4
The characteristics of three-dimensional real inversion recovery MRI sequence in delayed Meniere’s disease	4
Auricular reconstruction using Medpor combined with different hearing rehabilitation approaches for microtia	3
Clinical factors associated with severe surgical complications in patients with hypopharyngeal cancer: a single-center case-cohort study	3
Low-intensity diode laser combined with nasal glucocorticoids in the treatment of recurrent epistaxis in children: a randomized controlled trail	3
Anterior glottoplasty: the effect of inclusion of the vocal fold lamina propria to frequency elevation	3
Actinomyces status and inflammatory biomarkers in post-tonsillectomy hemorrhage cases	3
The auxiliary effect of vitamin D in the treatment of chronic rhinosinusitis with nasal polyposis, a clinical trial	3
Oropharyngeal microbiome in children with adenotonsillar hypertrophy and after adenotonsillectomy	3
Retreatment with nivolumab for patients with recurrent and/or metastatic head and neck cancer	3
The impact of adverse reactions on adherence to sublingual immunotherapy for Japanese cedar pollinosis and house dust mite allergy in Japan	3
Adults with unilateral congenital ear canal atresia – sound localization ability and recognition of speech in competing speech in unaided condition	3
Prevalence of severe-to-Profound hearing loss in the adult Swedish population and comparison with cochlear implantation rate	3
Cochlear implantation in a familial rare syndromic ossification-related deafness and literature review	3
Total auricular reconstruction concomitant with BONEBRIDGE implantation using a retrosigmoid sinus approach	3
Neuromuscular retraining therapy combined with preceding botulinum toxin A injection for chronic facial paralysis	3
Impact of fast-track on recurrence and malignant transformation of patients with inverted papilloma	3
Surgical outcome of different surgical modalities for adult recurrent respiratory papillomatosis	3
Insulin regulates Nedd4-2 via a PKB-dependent mechanism in HEI-OC1 auditory cells-crosstalks with sphingolipid and cAMP signaling	3
Long-term efficacy of turbinoplasty compared with medical treatment in patients with allergic rhinitis	3
Adaptive changes in human inferior turbinates between humid and dry climates	3
KTP laser alone or combined with bleomycin for pharyngolaryngeal hemangioma: a lesion grade-based determination of prognosis	3
Evaluation of functional and aesthetic outcomes following open technique septorhinoplasty: assessing the utility and correlation of the Rhinoplasty Health Inventory and Nasal Outcomes, Rhinoplasty Out	3
Are there relationship otosclerosis with serum HE4 and CA125 level? A pilot study	3
The effect of local dexamethasone on stapedotomy surgery outcomes in patients with otosclerosis	3
Can EPOS2020 criteria of type 2 inflammation be applied to Asian patients with chronic rhinosinusitis?	3
Transoral robotic surgery in otolaryngology practice: a single institutional experience	3
Hearing loss in school-aged children	3
Development of a novel centrifugal extraction device to collect the olfactory cleft mucus	3
Chronic rhinosinusitis with nasal polyps: predictors of recurrence 5 years after surgery	3
Uptake of gadolinium and dexamethasone in rat inner ear and facial nerve using different administrations	3
Incidence of adult tonsillectomy for hypertrophic indications in Southwest Finland	3
The characteristics of hearing loss in outpatients with tinnitus over the age of 60: a 11-year cross-sectional study	3
Different results of vestibular examinations and blood flow in cases with transient vascular vertigo/dizziness with or without central nervous system symptoms	3
The French way of voice rehabilitation post total laryngectomy: current clinical practices and tendencies	3
Evaluation of automatic cochlear dimension measurement using ALPACA: a comparative study	3
Minigene assay for verifying the splicing effects of the rare variants in the SLC12A2 gene at c.2930-1G>a	3
Feasibility of conducting type III home sleep apnoea test in children	3
Association of iron deficiency with chronic suppurative otitis media in adults	3
Endoscopic butterfly cartilage myringoplasty: our long term results	3
Comparison of therapeutic effects of steroid injection by benign vocal fold lesion type	3
Clinical diagnosis and treatment of G2 laryngeal neuroendocrine tumors	2
Hearing and balance functions in adults with ıron deficiency	2
Impaired geriatric 8 score is associated with worse survival after radical intensity modulated radiation therapy in elderly patients with nasopharyngeal carcinoma	2
Hearing loss after bacterial meningitis, a retrospective study	2
Effect of unilateral cochlear implant use on contralateral electrically evoked auditory brainstem responses to round window membrane electrical stimulation	2
Preliminary dynamic observation of wound healing after low-temperature plasma radiofrequency ablation for laryngeal leukoplakia	2
Cochlear implant surgery facilitates intracochlear distribution of perioperative systemic steroids	2
Prophylactic contralateral neck dissection has no advantage in patients with early stage HPV-positive tonsil cancer	2
Diagnosis and management of eosinophilic otitis media: a systematic review	2
Starplasty contributes to reduce tracheostomal granulation in pediatric tracheostomy	2
Presence of endolymphatic hydrops on listening difficulties in patients with normal hearing level	2
Cochlear implantation in older adults: 15 years’ experience of a tertiary centre in a developing country	2
The contribution of oncological lateral skull base surgery to the management of advanced head-neck tumors	2
Measurement of stapes footplate thickness using ultra-high-resolution computed tomography: stapes axial plane correlates better with otosclerosis than lateral semicircular canal plane	2
Endoscopic transcanal butterfly cartilage myringoplasty outcome; which parameters affect long-term results?	2
Ototoxicity associated with hematopoietic stem cell transplantation; what are the risk factors?	2
Do different types of cochlear implant electrode influence hearing preservation and speech perception?	2
Hearing outcomes in subtotal facial nerve decompression with preserving ossicular chain intact	2
The predictive utility of atherosclerosis-related risk factors as predictors of the prognosis of idiopathic sudden sensorineural hearing loss in older adults	2
Gene mutations and clinical prognosis of mucosal melanoma in different locations of head and neck	2
Circulating fatty acids in patients with head and neck cancer after treatment: an explorative study with a one-year perspective	2
Otosclerosis: audiometric results and quality of life after stapedectomy with interposition or CO2 laser-calibrated stapedotomy without interposition	2
Does cochlear implant electrode array design affect audiologic outcomes? A systematic review and meta-analysis	2
Locally advanced sinonasal adenoid cystic carcinomas: endoscopic endonasal surgery-centered comprehensive treatment provides benefits	2
Progression of endolymphatic hydrops and vertigo during treatment in Meniere’s disease	2
Flap suturing endonasal dacryocystorhinostomy assisted by ultrasonic bone aspirator	2
Compensation in neuro-system related to age-related hearing loss	2
The effect of SLC26A4 gene mutations on long-term rehabilitative outcomes in cochlear implant patients	2
Innovated surgery incision for patients of congenital malformation of the middle and outer ear with infection (CMMOEI)	2
Scala tympani drill-out technique for oval window atresia with malformed facial nerve:update	2
Positive factors on survival of head and neck cancer of unknown primary: what the clinician can do	2
Safety of high-power short pulse single spot diode laser stapedotomy: an experimental animal study	2
Vestibular nerve deficiency and vestibular function in children with unilateral hearing loss caused by cochlear nerve deficiency	2
Shifting paradigms in endoscopic sinus surgery: a comprehensive analysis from Japan’s national database	2

Long-term survival outcomes after primary transoral robotic surgery (TORS) with concurrent neck dissection for early-stage oropharyngeal squamous cell carcinoma	2
Evaluation of the vestibular system in individuals with presbycusis using video head impulse test and videonystagmography	2
Somatic genetic alterations of oncogenes and tumor suppressor genes in cholesteatoma	2
Optical measurements of eardrum vibrations and sound propagation in the ear canal for the fitting of active middle ear implants	2
Intratympanic gentamicin injection for refractory ménière's disease (MD) has potential effect in preventing contralateral MD occurrence	2
Underwater posterior nasal neurectomy compared to resection of peripheral branches of posterior nerve in severe allergic rhinitis	2
A designed ladder-shaped stent for the treatment of refractory hypopharyngeal corrosive strictures	2
Prevention of progressive hearing loss in a mouse model of diabetes by oral intake of eicosapentaenoic acid ethyl ester	2
Factors related to the surgical outcomes of type I tympanoplasty for tympanic membrane perforation in children	2
Trapezius muscle branch of the spinal accessory nerve without penetrating the sternocleidomastoid muscle as a pitfall in neck dissection: prevalence in a Japanese institution and a protocol for the pr	2
A tool developed for Chinese olfactory screening: culturally adapted version of “Quick olfactory Sniffin’ Sticks Test (Q-Sticks)”	1
Analysis of the effectiveness of hearing solutions for congenital malformation of the middle and outer ear (CMMOE)	1
A 14-year nationwide epidemiological analysis of delayed endolymphatic hydrops in Japan	1
OCT imaging of endolymphatic hydrops in mice: association with hearing loss	1
Tympanostomy tube placement for intractable Meniere’s disease in the elderly	1
Immediate effect of recurrent laryngeal nerve stimulation in patients with idiopathic unilateral vocal fold paralysis	1
Association between hearing loss and trauma based on population data of Korea	1
Examining the causal relationship between hypertension and benign paroxysmal vertigo: a univariate and multivariate Mendelian randomization study	1
Investigation of the applicability of internet-based approach to subjective tinnitus	1
Ferroptosis inhibition shields house ear institute-organ of corti 1 cells from free fatty acids-induced inflammatory injuries	1
Whole-exome sequencing for screening noise-induced hearing loss susceptibility genes	1
Correction	1
Efficiency of a novel middle ear pressure device for intractable definite Meniere’s disease and delayed endolymphatic hydrops after certification by the public health insurance system in Japan	1
Olfactory function trends in COVID-19 patients: a prospective cohort study	1
Study of hearing features of Congenital Malformation of the Middle and Outer Ear (CMMOE)	1
Circumferential subannular tympanoplasty: surgical and hearing outcome in 224 ears with subtotal perforation	1
Auditory agnosia progressing to cortical deafness. Long-term follow up of a one-year-old child to age 37	1
Evaluation of nasal microplastic densities in patients with acute and chronic rhinitis	1
Lymphomas of the salivary glands: a systematic review	1
Examination of inner ear structures: a micro-CT study	1
Estimated number and prevalence of patients with delayed endolymphatic hydrops in Japan: a nationwide survey	1
Do CT values change over time and correlate with hearing in the non-surgical ears of otosclerosis patients?	1
Preoperative factors influencing the rate and speed of available communication ability in prelingual paediatric cochlear implantation recipients	1
The impact of labyrinthine magnetic resonance signal alterations on the treatment of sudden sensory-neural hearing loss	1
OnabotulinumtoxinA injection towards the SPG for treating symptoms of refractory chronic rhinosinusitis with nasal polyposis: a pilot study	1
Feasibility exploration of cortical auditory evoked potentials evoked by spectro-temporal modulation signals	1
Narrow band imaging in oral cancer did not improve visualisation of the tumour borders: a prospective cohort study	1
The correlation of hearing prognosis and caloric test results in Meniere’s disease: a follow up study	1
ABO blood type correlates with risk and protective factors for chronic suppurative otitis media	1
Indications and complications of secondary tracheoesophageal puncture in Chinese laryngectomees	1
Comparative efficacy of topical lidocaine, tetracaine, and articaine for post-tonsillectomy pain management in children: a prospective, placebo-controlled study	1
Association of contrast-enhanced MRI of inner ear and caloric response in patients with clinically diagnosed ipsilateral delayed endolymphatic hydrops	1
Characteristics of electrically evoked auditory brainstem response in children with large vestibular aqueduct syndrome after cochlear implantation	1
A 10-year in-depth follow-up of post-lingual hearing loss patients with Chinese domestic cochlear implants	1
Vestibular function in children with vestibulocochlear nerve aplasia/hypoplasia	1
Differences in semicircular canal function in the video head impulse test in patients in the chronic stage of sudden sensorineural hearing loss with vertigo and vestibular neuritis	1
Isolated bilateral posterior semicircular canal hypofunction: comparison with bilateral vestibulopathy	1
Association between secretory otitis media and laryngopharygeal reflux in adults	1
Clinical significance of posterior expansion of the utricular endolymphatic space	1
Outcomes of transcanal endoscopic middle ear surgery for congenital cholesteatoma	1
Identification of Transforming Growth Factor-β1 in the nasal polyp tissue of chronic rhinosinusitis: a comprehensive analysis	1
Did our cochlear implant program make any difference in the lives of our patients? Achievements of 30 patients with long term follow-up averaging 20 years after cochlear implantation	1
Audiological outcomes and their association with quality of life in patients undergoing stapedotomy	1
Association between NF-E2-related factor 2 polymorphism and age-related hearing loss in the general Japanese population from the Iwaki health promotion project	1
The influence of saliva pepsin concentration on subjective severity of seasonal allergic rhinitis	1
Nutrition impact symptoms in head and neck cancer during radiotherapy: a longitudinal study	1
Clinical features and short-term outcomes of bilateral sudden sensorineural hearing loss: an eight-year experience at a tertiary center	1
Added value of HPV-DNA in situ hybridization as an adjunct to p16 Immunohistochemistry in oropharyngeal squamous cell carcinoma	1
Evaluation of the blood–perilymph barrier in ears with endolymphatic hydrops	1
Mandibular resection in patients with head and neck cancer: acute and long-term complications after reconstruction	1
Incidence of pediatric tonsillitis, otitis and upper respiratory infectious entities in the pre and post COVID-19 quarantine eras	1
Stress reactions in a tertiary oto-rhino-laryngological department during the first wave of the COVID-19 pandemic in the Danish Capital region	1
Treatment of otomycosis with clotrimazole: results accordingly with the fungus isolated	1
Comparison of surgical results between ‘atticosinuplasty’ and canal wall up mastoidectomy for early-stage cholesteatoma	1
Postoperative outcome of palatine tonsillectomy by tonsil pillar suture with knot-free suture	1
Plasma knife sphenopalatine artery cauterization via lateral nasal wall incision for posterior epistaxis	1
Long-term outcomes of extracapsular tonsillectomy in the treatment of obstructive sleep apnoea in adults	1
Imaging features, staging system, and surgical management of giant cell lesions of the temporal bone	1
‘Precursory symptoms, awareness or progression of facial palsy’ are more useful than ‘forehead wrinkling ability’ in differentiating central facial palsy examined in the emergency department	1
Transcanal endoscopic management of isolated congenital middle ear malformations	1
Immunosuppressive protocols after laryngeal transplantation: a systematic review	1
Comparative analysis of postoperative adjuvant therapy for head and neck mucosal melanoma in China	1
Risk factors of decompensated tinnitus and the interaction effect of anxiety and poor sleep on decompensated tinnitus: a multicenter study	1
Comparison of inner ear deficits in Meniere’s variants and their significance	1
Modified oropharyngeal muscle training and scientific vocalization are effective in treating mild-to-moderate obstructive sleep apnea hypoventilation syndrome in adults	1
The global, regional, and national burden of nasopharyngeal carcinoma and its attributable risk factors in 204 countries and territories, 1990–2019	1
The 133-kDa N-terminal region of myosin XVa is critical for normal structure and function of auditory and hair cells	1
Prognostic factors of early-onset otitis media with effusion in children treated using tympanostomy	1
Prognostic significance of nutritional indices in patients with head and neck squamous cell carcinoma treated with immune checkpoint inhibitors	1
Clinical Features and prognostic factors in pediatric deep neck infections: a retrospective study	1
Magnetic resonance imaging of endolymphatic hydrops in patients with unilateral Meniere’s disease: volume ratio and distribution rate of the endolymphatic space	1
Prognosis prediction changes based on the timing of electroneurography after facial paralysis	1
Lymph node density as prognostic factor in regional recurrent or residual head and neck cancer	1
Quantitative and qualitative evaluation of anti-pneumococcal specific antibodies in children with recurrent acute otitis media	1
Acute acoustic traumas caused by large-caliber weapons and explosions among conscripts in the Finnish Defence Forces – a population-based survey	1
Translation, validation, and psychometric evaluation of the Italian version of the facial clinimetric evaluation (FaCE) scale for patients with peripheral facial palsy	1
Serum fat-soluble vitamin levels may be related to sudden sensorineural hearing loss	1
Vestibular test results in patients with vestibular migraine and Meniere’s Disease	1
Balloon dilatation versus CO2 laser surgery in subglottic stenosis, a retrospective analysis of therapeutic approaches	1
Taste and acoustic reflex after recovery from facial muscle paralysis in patients with facial nerve palsy	1
Therapeutic efficacy of canalith reposition maneuver according to the determination method of lesion side in patients with persistent geotropic direction-changing positional nystagmus	1
The feasibility of vagal nerve stimulation revision surgery and surgical techniques: a retrospective review	1
Identifying chronic rhinosinusitis without nasal polyps by analyzing aspirated nasal air with an electronic nose based on differential mobility spectrometry	1
Horizontal middle partial laryngectomy with cricothyroidopexy: an effective treatment for stage T1b glottic carcinoma	1
Analysis of influencing factors of residual dizziness after repositioning of horizontal semicircular canal benign paroxysmal positional vertigo	1