1. Department of Obstetrics and Gynecology, Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
2. The Korea Institute for Public Sperm Bank, Busan, Korea.
3. Department of Obstetrics and Gynecology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea.
4. Department of Obstetrics and Gynecology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
5. Infertility Institute, Pohang Women's Hospital, Pohang, Korea.