1 Department of Surgery and Science, Graduate School of Medical Science, Kyushu University, 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan. Electronic address: tikesurg@surg2.med.kyushu-u.ac.jp.
2 Department of Surgery and Science, Graduate School of Medical Science, Kyushu University, 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan.