1 Department of Surgery, Tokyo Bay Urayasu Ichikawa Medical Center (Noguchi Hideyo Memorial International Hospital), Chiba, Japan. Electronic address: x62h20k38@yahoo.co.jp.
2 Department of Surgery, Tokyo Bay Urayasu Ichikawa Medical Center (Noguchi Hideyo Memorial International Hospital), Chiba, Japan.
3 Department of Surgery, Jichi Medical University, Tochigi, Japan.