1. Department of Medicine, Graduate School, University of Hanyang Haeng Dang-Dong, Seong Dong-ku, Seoul, Korea
2. Department of Obstetrics and Gynecology, Eulji General Hospital, Eulji-Ro 3-ga, Chung-ku, Seoul, Korea
3. Department of Biochemistry, Meiji College of Pharmacy, Nozawa, Setagaya-ku, Tokyo, Japan
4. Department of Obstetrics and Gynecology, School of Medicine, Keio University, Shinanomachi Shinjiku-ku, Tokyo, Japan
5. Keiai Research Institute for Infertility, Ikebukuro, Toshima-ku, Tokyo, Japan
6. Department of Obstetrics and Gynecology, Tachikawa Kyosai Hospital, Nishikicho, Tachikawa-shi, Tokyo, Japan