1. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
2. Medical Research Institute, Pusan National University School of Medicine, Busan, Korea.
3. Division of Nephrology, Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
4. Division of Infectious Disease, Department of Obstetrics and Gynecology, Pusan National University School of Medicine, Busan, Korea.