1 Departments of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 82 Gumi-ro 173 Beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea.
2 Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea.
3 Department of Internal Medicine, Inje University Busan Paik Hospital, Busan, Korea.
4 Department of Internal Medicine, Jeonbuk National University Hospital, Jeonju, Republic of Korea.
5 Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea.
6 Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea.
7 Departments of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Republic of Korea.
8 Departments of Internal Medicine, Kangwon National University Hospital, Chunchon, Republic of Korea.
9 Departments of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Republic of Korea.
10 Departments of Internal Medicine, Gyeongsang National University Hospital, Jinju, Republic of Korea.
11 Departments of Internal Medicine, Jeju National University Hospital, Jeju, Republic of Korea.
12 Seoul Clinical Laboratories, Yongin, Republic of Korea.
13 Departments of Internal Medicine, Chungnam National University Hospital, 282 Munhwa-ro, Jung-gu, Daejeon, 35015, Republic of Korea. gie001@cnuh.co.kr.
14 Departments of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 82 Gumi-ro 173 Beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea. jsh@snubh.org.