1. Department of Internal Medicine, Pusan National University Hospital and Biomedical Research Institute, Pusan National University School of Medicine, Busan, Korea.
2. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
3. Department of Internal Medicine, Busan St. Mary's Hospital, Busan, Korea.
4. Department of Radiology, Busan St. Mary's Hospital, Busan, Korea.