[1] Saiseikai Yokohamashi Tobu Hosp, Dept Surg, Tsurumi Ku, 3-6-1 Shimosueyoshi, Yokohama, Kanagawa 2308765, Japan
[2] Keio Univ, Sch Med, Dept Surg, Shinjuku Ku, 35 Shinanomachi, Tokyo 1608582, Japan
[3] Saiseikai Kanagawaken Hosp, Dept Surg, Kanagawa Ku, 6-6 Tomiya Chou, Yokohama, Kanagawa 2210821, Japan