1) Second Department of Surgery, Chiba University, School of Medicine, Chiba, Japan
2) Third Department of Internal Medicine, Chiba University, School of Medicine, Chiba, Japan
3) Department of Surgery, Kawasaki Steel Corporation Self lnsurance Society Chiba Hospital, Chiba, Japan
4) First Department of Anatomy, Chiba University, School of Medicine, Chiba, Japan

Yutaka Funami¹⁾, Takeshi  Ishide²⁾, Kazuaki Okuyama¹⁾, Yoshikazu Yamamoto³⁾, Yukio  Seki³⁾, Kaichi Isono¹⁾, Yutaka Shimada⁴⁾