Asserhoj LL, Spangmose AL, Aaris Henningsen AK, Clausen TD, et al. Adverse obstetric and perinatal outcomes in 1,136 singleton pregnancies conceived
after programmed frozen embryo transfer (FET) compared with natural cycle FET. Fertil Steril 2021 Jan 15. pii: S0015-0282(20)32553.
PMID: 33461756