1. Division of Hemato-Oncology, Department of Internal Medicine, Kangnam Sacred-Heart Hospital, Hallym University Medical Center, Hallym University College of Medicine, Seoul, Republic of Korea
2. Division of Internal Medicine, National Army Capital Hospital, The Armed Forces Medical Command, Sungnam, Republic of Korea
3. Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea