1. Department of Obstetrics and Gynecology, Inje University, Ilsan-Paik Hospital, Goyang, Korea;
2. Department of Obstetrics and Gynecology, Jeju National University Hospital, Jeju, Korea;
3. Department of Internal Medicine, Inje University, Ilsan-Paik Hospital, Goyang, Korea;
4. Department of Radiology, Inje University, Ilsan-Paik Hospital, Goyang, Korea