1. Department of Hematology, Endocrinology and Metabolism Niigata University Faculty of Medicine, Japan
2. Japanese Red Cross Society Niigata Blood Center, Japan
3. Division of Stem Cell Transplantation, Niigata University Medical and Dental Hospital, Japan
4. Division of Blood Transfusion, Niigata University Medical and Dental Hospital, Japan
5. Division of Gastroenterology and Hepatology, Niigata University Medical and Dental Hospital, Japan