1. Deparment of Internal Medicine, Pusan National University School of Medicine, Medical Research Institute, Pusan National University Hospital, Busan, Korea.
2. Deparment of Family Medicine, Yangsan Pusan National University Hospital, Yangsan, Korea.
3. Deparment of Obstetrics & Gynecology, Pusan National University Hospital, Busan, Korea.
4. Deparment of Pathology, Pusan National University Hospital, Busan, Korea.