Qin L, Duan X, Dong JZ, Chang Y, Han Y, Li Y, Jiang W, Fan H, Hou X, Cao W, Zhu H, Li T. The unreversible reduced but persistent activated NK and CD8(+) T cells in severe/critical COVID-19 during omicron pandemic in China. Emerg Microbes Infect. 2023;12:2208679. https://doi.org/10.1080/22221751.2023.2208679.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Zheng L, Liu S, Lu F. Impact of National Omicron Outbreak at the end of 2022 on the future outlook of COVID-19 in China. Emerg Microbes Infect. 2023;12:2191738. https://doi.org/10.1080/22221751.2023.2191738.

Article  PubMed  PubMed Central  Google Scholar 

Bureau CsB. China says 80% of population have had Covid-19, as millions travel for Lunar New Year. Cable News Network. https://www.cnn.com/2023/01/22/china/china-covid-80-lunar-new-year-intl-hnk/index.html. Accessed July 1, 2023.

Liang J, Liu R, He W, Zeng Z, Wang Y, Wang B, Liang L, Zhang T, Chen CLP, Chang C, Hon C, Lau EHY, Yang Z, Tong K. Infection rates of 70% of the population observed within 3 weeks after release of COVID-19 restrictions in Macao. China J Infect. 2023;86:402–4. https://doi.org/10.1016/j.jinf.2023.01.029.

Article  PubMed  Google Scholar 

Domar AD, Shah JS, Gompers A, Meyers AJ, Khodakhah DR, Hacker MR, Penzias AS, Sakkas D, Toth TL, Vaughan DA. The psychological impact of the coronavirus disease 2019 pandemic on women who become pregnant after receiving treatment for infertility: a longitudinal study. F S Rep. 2022;3:71–8. https://doi.org/10.1016/j.xfre.2022.01.004.

Article  PubMed  PubMed Central  Google Scholar 

Allotey J, Stallings E, Bonet M, Yap M, Chatterjee S, Kew T, Debenham L, Llavall AC, Dixit A, Zhou D, Balaji R, Lee SI, Qiu X, Yuan M, Coomar D, Sheikh J, Lawson H, Ansari K, van Wely M, van Leeuwen E, Kostova E, Kunst H, Khalil A, Tiberi S, Brizuela V, Broutet N, Kara E, Kim CR, Thorson A, Oladapo OT, Mofenson L, Zamora J, Thangaratinam S. Clinical manifestations, risk factors, and maternal and perinatal outcomes of coronavirus disease 2019 in pregnancy: living systematic review and meta-analysis. BMJ. 2020;370:m3320. https://doi.org/10.1136/bmj.m3320.

Article  PubMed  Google Scholar 

Chen L, Li Q, Zheng D, Jiang H, Wei Y, Zou L, Feng L, Xiong G, Sun G, Wang H, Zhao Y, Qiao J. Clinical characteristics of pregnant women with Covid-19 in Wuhan, China. N Engl J Med. 2020;382:e100. https://doi.org/10.1056/NEJMc2009226.

Article  CAS  PubMed  Google Scholar 

Hantoushzadeh S, Shamshirsaz AA, Aleyasin A, Seferovic MD, Aski SK, Arian SE, Pooransari P, Ghotbizadeh F, Aalipour S, Soleimani Z, Naemi M, Molaei B, Ahangari R, Salehi M, Oskoei AD, Pirozan P, Darkhaneh RF, Laki MG, Farani AK, Atrak S, Miri MM, Kouchek M, Shojaei S, Hadavand F, Keikha F, Hosseini MS, Borna S, Ariana S, Shariat M, Fatemi A, Nouri B, Nekooghadam SM, Aagaard K. Maternal death due to COVID-19. Am J Obstet Gynecol. 2020;223:109.e1-e16. https://doi.org/10.1016/j.ajog.2020.04.030.

Article  CAS  PubMed  Google Scholar 

Knight M, Bunch K, Vousden N, Morris E, Simpson N, Gale C, O’Brien P, Quigley M, Brocklehurst P, Kurinczuk JJ. Characteristics and outcomes of pregnant women admitted to hospital with confirmed SARS-CoV-2 infection in UK: national population based cohort study. BMJ. 2020;369:m2107. https://doi.org/10.1136/bmj.m2107.

Article  PubMed  PubMed Central  Google Scholar 

Yan J, Guo J, Fan C, Juan J, Yu X, Li J, Feng L, Li C, Chen H, Qiao Y, Lei D, Wang C, Xiong G, Xiao F, He W, Pang Q, Hu X, Wang S, Chen D, Zhang Y, Poon LC, Yang H. Coronavirus disease 2019 in pregnant women: a report based on 116 cases. Am J Obstet Gynecol. 2020;223:111.e1-e14. https://doi.org/10.1016/j.ajog.2020.04.014.

Article  CAS  PubMed  Google Scholar 

Sentilhes L, De Marcillac F, Jouffrieau C, Kuhn P, Thuet V, Hansmann Y, Ruch Y, Fafi-Kremer S, Deruelle P. Coronavirus disease 2019 in pregnancy was associated with maternal morbidity and preterm birth. Am J Obstet Gynecol. 2020;223:914.e1-e15. https://doi.org/10.1016/j.ajog.2020.06.022.

Article  CAS  PubMed  Google Scholar 

Piekos SN, Roper RT, Hwang YM, Sorensen T, Price ND, Hood L, Hadlock JJ. The effect of maternal SARS-CoV-2 infection timing on birth outcomes: a retrospective multicentre cohort study. Lancet Digit Health. 2022;4:e95–104. https://doi.org/10.1016/s2589-7500(21)00250-8.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Cosma S, Carosso AR, Borella F, Cusato J, Bovetti M, Bevilacqua F, Carosso M, Gervasoni F, Sciarrone A, Marozio L, Revelli A, Rolfo A, Filippini C, Ghisetti V, Di Perri G, Benedetto C. Prenatal biochemical and ultrasound markers in COVID-19 pregnant patients: a prospective case-control study. Diagnostics (Basel). 2021;11. https://doi.org/10.3390/diagnostics11030398.

Auger N, Arbour L, Lewin A, Brousseau É, Healy-Profitós J, Luu TM. Congenital anomalies during Covid-19: artifact of surveillance or a real TORCH? Eur J Epidemiol. 2024;39:613–21. https://doi.org/10.1007/s10654-024-01122-8.

Article  PubMed  Google Scholar 

Wyns C, De Geyter C, Calhaz-Jorge C, Kupka MS, Motrenko T, Smeenk J, Bergh C, Tandler-Schneider A, Rugescu IA, Goossens V. ART in Europe, 2018: results generated from European registries by ESHRE. Hum Reprod Open. 2022;2022:hoac022. https://doi.org/10.1093/hropen/hoac022.

Article  CAS  PubMed  PubMed Central  Google Scholar 

Jwa SC, Seto S, Takamura M, Kuwahara A, Kajihara T, Ishihara O. Ovarian stimulation increases the risk of ectopic pregnancy for fresh embryo transfers: an analysis of 68,851 clinical pregnancies from the Japanese Assisted Reproductive Technology registry. Fertil Steril. 2020;114:1198–206. https://doi.org/10.1016/j.fertnstert.2020.06.032.

Article  CAS  PubMed  Google Scholar 

Chen ZJ, Shi Y, Sun Y, Zhang B, Liang X, Cao Y, Yang J, Liu J, Wei D, Weng N, Tian L, Hao C, Yang D, Zhou F, Shi J, Xu Y, Li J, Yan J, Qin Y, Zhao H, Zhang H, Legro RS. Fresh versus frozen embryos for infertility in the polycystic ovary syndrome. N Engl J Med. 2016;375:523–33. https://doi.org/10.1056/NEJMoa1513873.

Article  PubMed  Google Scholar 

Lu Y, He Y, Wang Y, Zhu Q, Qi J, Li X, Ding Y, Huang J, Ding Z, Xu Y, Yang Y, Lindheim SR, Wei Z, Sun Y. Effects of SARS-COV-2 infection during the frozen-thawed embryo transfer cycle on embryo implantation and pregnancy outcomes. Hum Reprod. 2024;39:1239–46. https://doi.org/10.1093/humrep/deae068.

Article  PubMed  Google Scholar 

Zegers-Hochschild F, Adamson GD, Dyer S, Racowsky C, de Mouzon J, Sokol R, Rienzi L, Sunde A, Schmidt L, Cooke ID, Simpson JL, van der Poel S. The international glossary on infertility and fertility care, 2017. Hum Reprod. 2017;32:1786–801. https://doi.org/10.1093/humrep/dex234.

Article  PubMed  PubMed Central  Google Scholar 

Nelissen EC, Van Montfoort AP, Coonen E, Derhaag JG, Geraedts JP, Smits LJ, Land JA, Evers JL, Dumoulin JC. Further evidence that culture media affect perinatal outcome: findings after transfer of fresh and cryopreserved embryos. Hum Reprod. 2012;27:1966–76. https://doi.org/10.1093/humrep/des145.

Article  PubMed  Google Scholar 

Chen Z, Deng X, Fang L, Sun K, Wu Y, Che T, Zou J, Cai J, Liu H, Wang Y, Wang T, Tian Y, Zheng N, Yan X, Sun R, Xu X, Zhou X, Ge S, Liang Y, Yi L, Yang J, Zhang J, Ajelli M, Yu H. Epidemiological characteristics and transmission dynamics of the outbreak caused by the SARS-CoV-2 Omicron variant in Shanghai, China: a descriptive study. Lancet Reg Health West Pac. 2022;29:100592. https://doi.org/10.1016/j.lanwpc.2022.100592.

Article  PubMed  PubMed Central  Google Scholar 

Shi W, Sun C, Chen Q, Ye M, Niu J, Meng Z, Bukulmez O, Chen M, Teng X. Association between ambient air pollution and pregnancy outcomes in patients undergoing in vitro fertilization in Shanghai, China: a retrospective cohort study. Environ Int. 2021;148:106377. https://doi.org/10.1016/j.envint.2021.106377.

Article  CAS  PubMed  Google Scholar 

Cao M, Wu Y, Lin Y, Xu Z, Liang Z, Huang Q, Li S, Liu H, An C, Luo Y, Liu H, Liu J. Inactivated Covid-19 vaccine did not undermine live birth and neonatal outcomes of women with frozen-thawed embryo transfer. Hum Reprod. 2022;37:2942–51. https://doi.org/10.1093/humrep/deac220.

Article  CAS  PubMed  Google Scholar 

Wei M, Chen D, Feng G, Mao X, Wu L, Chai W, Zhang J. Association of infertility cause with perinatal outcomes in a freeze-all policy: an analysis including 10,151 singleton newborns. AJOG Glob Rep. 2023;3:100098. https://doi.org/10.1016/j.xagr.2022.100098.

Article  PubMed  Google Scholar 

Wang B, Zhang J, Zhu Q, Yang X, Wang Y. Effects of different cycle regimens for frozen embryo transfer on perinatal outcomes of singletons. Hum Reprod. 2020;35:1612–22. https://doi.org/10.1093/humrep/deaa093.

Article  CAS  PubMed  Google Scholar 

Zhang J, Liu H, Wang Y, Mao X, Chen Q, Fan Y, Xiao Y, Kuang Y. Letrozole use during frozen embryo transfer cycles in women with polycystic ovary syndrome. Fertil Steril. 2019;112:371–7. https://doi.org/10.1016/j.fertnstert.2019.04.014.

Article  CAS  PubMed  Google Scholar 

Medicine ASiR, Embryology ESIGo. The Istanbul consensus workshop on embryo assessment: proceedings of an expert meeting†. Hum Reprod. 2011;26:1270–83. https://doi.org/10.1093/humrep/der037.

Gardner DK, Surrey E, Minjarez D, Leitz A, Stevens J, Schoolcraft WB. Single blastocyst transfer: a prospective randomized trial. Fertil Steril. 2004;81:551–5. https: