Department of Internal Medicine;
Pusan National University School of Medicine and Biomedical Research Institute;
Pusan National University Hospital;
Department of Internal Medicine;
the Catholic University of Korea;
College of Medicine;
Department of Internal Medicine;
Kyung Hee University Hospital at Gang Dong;
Kyung Hee University School of Medicine;
Department of Internal Medicine;
Konkuk University School of Medicine;
Department of Internal Medicine;
Soonchunhyang University Cheonan Hospital;
Soonchunhyang University College of Medicine;