1. Department of Internal Medicine, Pusan National University School of Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
2. Department of Internal Medicine, Inje University College of Medicine, Inje University Busan Paik hospital, Busan, Korea.
3. Department of Obstetrics and Gynecology, Pusan National University School of Medicine, Pusan National University Hospital, Busan, Korea.