Fig. 1.

Schematic diagram of controlled ovarian hyperstimulation protocol. On the menstrual cycle day 3, recombinant FSH was started at adjusted dose individually. Once the largest follicle reached 14 mm in diameter, 0.25 mg of GnRH antagonist was started. 10,000 IU of urinary hCG (u-hCG) or 250 µg of recombinant hCG (r-hCG) was administrated when leading follicle reached 18 mm in diameter. GnRH antagonist was administered daily until the day of hCG administration (Group A) or the day before hCG administration (Group B).