1. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Asan Medical Center, College of Medicine, University of Ulsan, 388-1 Poognap-dong, Songpa-gu, Seoul 138-736, Republic of Korea
2. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Haeundae Paik Hospital, College of Medicine, Inje University, Busan, Republic of Korea