[1] Hokkaido Univ, Gastroenterol Surg 1, Sapporo, Hokkaido, Japan
[2] Hokkaido Univ, Transplant Surg, Sapporo, Hokkaido, Japan
[3] Hokkaido Univ, Div Organ Transplantat, Sapporo, Hokkaido, Japan
[4] Nippon Kayaku, Tokyo, Japan
[5] Hokkaido Univ, Inst Genet Med, Sapporo, Hokkaido, Japan
[6] St Mary Hosp, Res Inst, Kurume, Fukuoka, Japan