1. Department of Obstetrics and Gynecology, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea.
2. Fertility Center, Miz Woman's Hospital, Daejeon, Korea.
3. Infertility Clinic, Department of Obstetrics and Gynecology, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea.