1. Division of Hematology and Oncology, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
2. Biomedical Research Center, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
3. Division of Hematology-Oncology, Soonchunhyang University College of Medicine, Seoul, Korea.