1 Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea (D.H., K.H.C., Y.B.S., T.K.P., J.H.Y., S.-H.C., H.-C.G., J.-Y.H., J.M.L.).
2 Chungbuk National University Hospital, Chungbuk National University College of Medicine, Cheongju, Korea (S.M.K.).
3 Chung-Ang University College of Medicine, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong, Korea (S.Y.L.).
4 Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea (J.-Y.L., S.-J.L.).
5 Wonkwang University Hospital, Iksan, Korea (K.H.Y., J.Y.C.).
6 The Catholic University of Korea, Uijeongbu St. Mary's Hospital, Seoul, Korea (C.J.K., H.-S.A.).
7 Keimyung University Dongsan Hospital, Daegu, Korea (C.-W.N., H.-J.Y.).
8 Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea (Y.H.P.).
9 Chung-Ang University College of Medicine, Chung-Ang University Hospital, Seoul, Korea (W.S.L.).
10 Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon, Korea (J.-O.J., P.S.S.).
11 Inje University Ilsan Paik Hospital, Goyang, Korea (J.-H.D.).
12 Cardiovascular Center, Hallym University Sacred Heart Hospital, Anyang, Korea (S.-H.J.).
13 Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea (C.-H.Y.).
14 Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, Korea (M.G.K., J.-S.K.).
15 The Catholic University of Korea, Incheon St Mary's Hospital, Seoul, Korea (K.Y.L.).
16 Hanyang University Seoul Hospital, College of Medicine, Hanyang University, Seoul, Korea (Y.-H.L.).
17 Hanyang University Myongji Hospital, Goyang, Korea (Y.-H.C.).
18 Kyung Hee University Hospital at Gangdong, Seoul, Korea (J.-M.C.).
19 Ewha Womans University College of Medicine, Seoul, Korea (W.J.J.).
20 Pusan National University Yangsan Hospital, Yangsan, Korea (K.-J.C.).