BRD2 and polycystic ovary syndrome: AFC: antral follicle count; AMH: anti-Müllerian hormone; BMI: body mass index; COS: controlled ovarian stimulation; ET: embryo transfer; FET: frozen embryo transfer; FSH: follicle-stimulating hormone; GnRH: gonadotropin-releasing hormone; hCG: human chorionic gonadotropin; ICSI: intracytoplasmic sperm injection; IVF: in vitro fertilization; IVM: in vitro maturation; LBR: live birth rate; NA: not applicable; PCOS: polycystic ovary syndrome; RIF: recurrent implantation failure.