1. Health Care Center, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
2. Department of Internal Medicine, Kangwon National University College of Medicine, Chuncheon, Korea
3. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
4. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
6. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea
7. Department of Internal Medicine, Gimpo Woori Hospital, Gimpo, Korea
8. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
9. Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea
10. Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea