1 Department of Internal Medicine, Pusan National University College of Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
2 Department of Internal Medicine, Pusan National University College of Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea. Electronic address: doc0224@pusan.ac.kr.
3 Department of Pathology, Pusan National University Hospital, Busan, Korea.