1. Division of Transfusion Medicine, Hirosaki University Hospital
2. Aomori Prefectural Joint Committee of Blood Transfusion Therapy
3. Division of Transfusion Medicine, Aomori Prefectural Central Hospital
4. Department of Surgery, Hachinohe General Hospital
5. Aomori Red-Cross Blood Center
6. Department of Gastroenterology and Hematology, Hirosaki University School of Medicine