1. Department of Internal Medicine, Pusan National University School of Medicine, Yangsan, Republic of Korea
2. Division of Nephrology, Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
3. Department of Internal Medicine, Gimhae Bokum Hospital, Gimhae, Republic of Korea
4. Division of Nephrology, Pusan National University Hospital, Busan, Republic of Korea