[1] Japanese Red Cross Date Gen Hosp, Dept Gastroenterol, Chiba, Japan
[2] Japanese Red Cross Date Gen Hosp, Dept Surg, Chiba, Japan
[3] Japanese Red Cross Date Gen Hosp, Dept Internal Med, Chiba, Japan
[4] Sapporo Med Univ, Sch Med, Dept Med Oncol & Hematol, Sapporo, Hokkaido, Japan