Evaluation of live birth rates and perinatal outcomes following two sequential vitrification/warming events at the zygote and blastocyst stages

Reply: Double vitrification and warming do not compromise the chance of live birth—a potential invalid conclusion

“…However, Nanassy et al . have also recently published a retrospective study demonstrating that live birth is reduced in the case of double vitrification ( Nanassy et al , 2023b ). Hence, they contend that we should have conducted an alternative analysis akin to the one undertaken in their study.…”