Affiliation: | 1. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea;2. Department of Internal Medicine, Inje University College of Medicine, Ilsan Paik Hospital, Goyang, Korea;3. Department of Internal Medicine, Korea University College of Medicine, Guro Hospital, Seoul, Korea;4. Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea |