1. Department of Gastroenterological and Transplantation Surgery, Graduates School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Hiroshima, Japan
2. Department of Surgery, Kure Medical Center, Chugoku Cancer Center, 3-1 Aoyama-cho, Kure 737-0023, Hiroshima, Japan
3. Division of Blood Transfusion Services, Hiroshima University Hospital, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Hiroshima, Japan