1. Department of Internal Medicine, Pusan National University Hospital, Pusan National University School of Medicine, Busan
2. Department of Internal Medicine, Dong-A University Hospital, Busan
3. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Busan
4. Department of Internal Medicine, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju
5. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan
6. Department of Internal Medicine, Inje University Busan Paik Hospital, Busan
7. Department of Internal Medicine, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea