[1] Jichi Med Univ, Dept Transplant Surg, Shimotsuke, Tochigi 3290498, Japan
[2] Hirosaki Univ, Sch Med, Dept Surg, Hirosaki, Aomori 036, Japan
[3] Jichi Med Univ, Dept Radiol, Shimotsuke, Tochigi 3290498, Japan
[4] Jichi Med Univ, Dept Surg, Shimotsuke, Tochigi 3290498, Japan