OOIR: Observatory of International Research

Papers

(The H4-Index of Human Reproduction Update is 39. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-06-01 to 2025-06-01.)

Article	Citations
False hope for patients with Klinefelter syndrome on cryopreservation of spermatogonia at younger ages	343
The pathophysiological role of estrogens in the initial stages of pregnancy: molecular mechanisms and clinical implications for pregnancy outcome from the periconceptional period to end of the first t	177
Maternal and perinatal outcomes in twin pregnancies following assisted reproduction: a systematic review and meta-analysis involving 802 462 pregnancies	161
Functional hypothalamic amenorrhoea and polycystic ovarian morphology: a narrative review about an intriguing association	116
Comparison of dietary and physical activity behaviors in women with and without polycystic ovary syndrome: a systematic review and meta-analysis of 39 471 women	116
Ultrasonographic criteria in the diagnosis of polycystic ovary syndrome: a systematic review and diagnostic meta-analysis	106
Fresh and cryopreserved ovarian tissue transplantation for preserving reproductive and endocrine function: a systematic review and individual patient data meta-analysis	91
Plasticity of the human preimplantation embryo: developmental dogmas, variations on themes and self-correction	84
Should women receive luteal support following natural cycle frozen embryo transfer? A systematic review and meta-analysis. Critical assessment of a review and meta-analysis	83
Correction to: Fresh and cryopreserved ovarian tissue transplantation for preserving reproductive and endocrine function: a systematic review and individual patient data meta-analysis	78
Obstetric and neonatal outcomes of pregnancies resulting from preimplantation genetic testing: a systematic review and meta-analysis	73
The complicated ART of finding consensus on family-building health policy: a comment on the IFFS consensus document	72
What is the optimal GnRH antagonist protocol for ovarian stimulation during ART treatment? A systematic review and network meta-analysis	71
Total fertilization failure after ICSI: insights into pathophysiology, diagnosis, and management through artificial oocyte activation	68
Autophagy: a multifaceted player in the fate of sperm	67
Driving factors in treatment decision-making of patients seeking medical assistance for infertility: a systematic review	67
A systematic review of the validated monogenic causes of human male infertility: 2020 update and a discussion of emerging gene–disease relationships	65
Temporal trends in sperm count: a systematic review and meta-regression analysis of samples collected globally in the 20th and 21st centuries	64
RNA modifications in female reproductive physiology and disease: emerging roles and clinical implications	63
Obstetric, neonatal, and child health outcomes following embryo biopsy for preimplantation genetic testing	60
Obstetric and perinatal outcomes of singleton pregnancies after blastocyst-stage embryo transfer compared with those after cleavage-stage embryo transfer: a systematic review and cumulative meta-analy	60
HLA Class Ib-receptor interactions during embryo implantation and early pregnancy	59
Reproductive ability in survivors of childhood, adolescent, and young adult Hodgkin lymphoma: a review	53
Reply: Artificial cycle frozen embryo transfer and obstetric adverse outcomes: association or causation?	50
Assessing the influence of preconception diet on female fertility: a systematic scoping review of observational studies	50

Prenatal and postnatal exposures to endocrine disrupting chemicals and timing of pubertal onset in girls and boys: a systematic review and meta-analysis	50
The neglected members of the family: non-BRCAmutations in the Fanconi anemia/BRCA pathway and reproduction	50
IVF and human evolution	49
What is the expected live birth rate per thawed oocyte?	48
The missing role of diagnosis of confined placental mosaicism in the management of fetal growth restriction	46
Cell dynamics in human villous trophoblast	45
Meiotic recombination: insights into its mechanisms and its role in human reproduction with a special focus on non-obstructive azoospermia	45
The LH surge and ovulation re-visited: a systematic review and meta-analysis and implications for true natural cycle frozen thawed embryo transfer	44
Early programming of reproductive health and fertility: novel neuroendocrine mechanisms and implications in reproductive medicine	44
Correction to: Evaluating interventions and adjuncts to optimize pregnancy outcomes in subfertile women: an overview review	44
Administration of growth hormone improves endometrial function in women undergoing in vitro fertilization: a systematic review and meta-analysis	43
COVID-19 in pregnant women: a systematic review and meta-analysis on the risk and prevalence of pregnancy loss	42
Infertility treatment and offspring blood pressure—a systematic review and meta-analysis	41
Novel microarchitecture of human endometrial glands: implications in endometrial regeneration and pathologies	39