GnRH-a	gonadotropin-releasing hormone agonist;
FET	frozen-thawed embryo transfer;
HRT	hormone replacement treatment;
NC	natural cycle;
LBR	live birth rate;
CPR	clinical pregnancy outcome;
ART	assisted reproductive techniques;
IVF-ET	in vitro fertilization-embryo transfer;
ICSI	intracytoplasmic sperm injection;
PCOS	polycystic ovary syndrome;
LH	luteinizing hormone;
HCG	human chorionic gonadotropin;
GEE	generalized estimation equation;
CET	cyro-embryo transfer;
BMI	body Mass Index;
FSH	follicle-Stimulating Hormone;
AMH	an-ti-Mullerian Hormone;
AFC	antral follicle counting;
OR	odds ratio;
CI	Confidence interval.