1. Division of Hematology-Oncology, Department of Internal Medicine, Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
2. Department of Internal Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Internal Medicine, Dankook University Hospital, Cheonan, Korea.
4. Department of Internal Medicine, Samsung Medical Center, Seoul, Korea.
5. Department of Internal Medicine, Inje University Busan Paik Hospital, Busan, Korea.
6. Department of Internal Medicine, Hallym University Sacred Heart Hospital, Seoul, Korea.
7. Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea.
8. Department of Internal Medicine, Severance Hospital, Seoul, Korea.