1. Division of Hemato-Oncology, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
2. Division of Hematology, Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea.
3. Division of Hemato-Oncology, Department of Internal Medicine, Soonchunhyang University Seoul Hospital, Seoul, Korea.