1. Department of Hematology-Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Pediatrics, Kyungpook National University School of Medicine, Daegu, Korea.
3. Department of Internal Medicine, Ewha Womans' University School of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
5. Department of Pediatrics, Chungnam National University School of Medicine, Daejeon, Korea.
6. Department of Internal Medicine, Seoul National University Hospital, Korea.
7. Department of Pediatrics, Chung-Ang University Hospital, Seoul, Korea.
8. Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea.
9. Department of Hematology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
10. Department of Pediatrics, Chonnam National University Hwasun Hospital, Hwasun, Korea.