“…In all, 371 thawing cycles were performed by administration of hormonal replacement therapy consisting of estradiol valerate (Progynova; Schering, Milan, Italy) at 2 mg/d from day 1 to day 5 of the menstrual cycle, 4 mg/d from day 6 to day 10, 6 mg/d from day 11 to day 13, and 4 mg/d from day 14. From day 15, 50 mg/d of P was given, and the dose was increased to 100 mg/d from day 17 (33).…”