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