From the Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea (S.-M.J., M.-K.L.); Diabetes Center, Eulji General Hospital, Eulji University School of Medicine, Seoul, Korea (K.A.H.); Department of Internal Medicine, Gangnam Sacred Heart Hospital, Hallym Medical University, Seoul, Korea (J.M.Y.); Department of Internal Medicine, Uijeongbu St. Mary's Hospital, The Catholic University of Korea, Seoul (T.S.S.); Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea (S.H.C.); Department of Internal Medicine, Yonsei University Wonju College of Medicine, Korea (C.H.C.); Department of Internal Medicine, Gachon University, Incheon, Korea (I.B.P.); Department of Endocrinology and Metabolism, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea (E.J.R.); Department of Internal Medicine, Korea University, Seoul (S.H.B.); Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea (T.S.P.); Department of Internal Medicine, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea (I.-K.L.); Department of Internal Medicine, St. Vincent's Hospital, The Catholic University of Korea, Suwon, Korea (S.-H.K.); Division of Endocrinology and Metabolism, Department of Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea (Y.-C.H.); Department of Internal Medicine, Severance Hospital, Yonsei University of Collage of Medicine, Seoul, Korea (B.S.C.); Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea (H.W.L.); and Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea (M.-S.N.). From the Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea (S.-M.J., M.-K.L.); Diabetes Center, Eulji General Hospital, Eulji University School of Medicine, Seoul, Korea (K.A.H.); Department of Internal Medicine, Gangnam Sacred Heart Hospital, Hallym Medical University, Seoul, Korea (J.M.Y.); Department of Internal Medicine, Uijeongbu St. Mary's Hospital, The Catholic University of Korea, Seoul (T.S.S.); Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea (S.H.C.); Department of Internal Medicine, Yonsei University Wonju College of Medicine, Korea (C.H.C.); Department of Internal Medicine, Gachon University, Incheon, Korea (I.B.P.); Department of Endocrinology and Metabolism, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea (E.J.R.); Department of Internal Medicine, Korea University, Seoul (S.H.B.); Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea (T.S.P.); Department of Internal Medicine, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea (I.-K.L.); Department of Internal Medicine, St. Vincent's Hospital, The Catholic University of Korea, Suwon, Korea (S.-H.K.); Division of Endocrinology and Metabolism, Department of Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea (Y.-C.H.); Department of Internal Medicine, Severance Hospital, Yonsei University of Collage of Medicine, Seoul, Korea (B.S.C.); Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea (H.W.L.); and Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea (M.-S.N.). leemk@skku.edu.