1. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea
2. Department of Internal Medicine, Pusan National University School of Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
3. Department of Pathology, Pusan National University School of Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea