1Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea. djkim@ajou.ac.kr
2Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seoul, Korea.
3Department of Internal Medicine, Kyung Hee University, East-West Neo Medical Center, Seoul, Korea.
4Department of Internal Medicine, Uijeongbu St. Mary's Hospital, Catholic University Medical College, Uijeongbu, Korea.
5Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
6Department of Internal Medicine, Cheju National University Hospital, Cheju National University School of Medicine, Jeju, Korea.
7Department of Internal Medicine, Yeungnam University College of Medicine, Yeungnam University Hospital, Daegu, Korea.
8Department of Internal Medicine, Pusan Paik Hospital, College of Medicine, Inje University, Busan, Korea.
9Department of Internal Medicine, Chonbuk National University Hospital, Jeonju, Korea.
10Department of Internal Medicine, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
11Department of Internal Medicine, Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
12Department of Internal Medicine, St. Vincent's Hospital, Catholic University Medical College, Suwon, Korea.
13Department of Internal Medicine, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.