1. Department of Surgery, Yokosuka General Hospital Uwamachi, 2-36 Uwamachi Yokosuka City, Kanagawa 238-8567, Japan
2. Department of Surgery, Saitama Medical Center, Jichi Medical University, 1-847 Amanuma-cho, Omiya-ku, Saitama 330-8503, Japan
3. Department of Pathology, Yokosuka General Hospital Uwamachi, 2-36 Uwamachi, Yokosuka, Kanagawa 238-8567, Japan