Fig. 1

Flowchart of this study. IVF in vitro fertilization, ICSI intracytoplasmic sperm injection, PPOS progestin-primed ovarian stimulation, FET frozen embryo transfer, LE Letrozole
Flowchart of this study. IVF in vitro fertilization, ICSI intracytoplasmic sperm injection, PPOS progestin-primed ovarian stimulation, FET frozen embryo transfer, LE Letrozole