1. Department of Obstetrics and Gynecology, Medical Research Center, College of Medicine, Seoul National University, Korea
2. Institute of Reproductive Medicine and Population, Medical Research Center, College of Medicine, Seoul National University, Korea
3. Central Research Institute, Sam Jin Pharm. Co., Ltd., Hwasung, Korea
4. R&D Center, Jeil Pharm. Co., Ltd., Yongin, Korea
5. Department of Physiology, Yonsei University College of Medicine, Seoul, Korea