1. First Department of Surgery, Yamaguchi University School of Medicine, 1-1-1, Minamikogushi, Ube, Yamaguchi, 755-8505, Japan
2. First Department of Physiology, Yamaguchi University School of Medicine, 1-1-1, Minamikogushi, Ube, Yamaguchi, 755-8505, Japan
3. Second Department of Internal Medicine, Yamaguchi University School of Medicine, 1-1-1, Minamikogushi, Ube, Yamaguchi, 755-8505, Japan