1. Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
2. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea
3. Division of Hematology-Oncology, Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
4. Division of Hematology/Oncology, Department of Medicine, Ajou University Medical Center, Suwon, Korea
5. Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
6. Division of Oncology, Department of Internal Medicine, Inje University College of Medicine, Haeundae Paik Hospital, Busan, Korea