Shozo Yokoyama, Katsunari Takifuji, Tsukasa Hotta, Kenji Matsuda, Toshiji Tominaga, Yoshimasa Oku, Toru Nasu, Koichi Tamura, Junji Ieda and Hiroki Yamaue*
* Corresponding author: Hiroki Yamaue yamaue-h@wakayama-med.ac.jp
BMC Surgery 2010, 10:8 doi:10.1186/1471-2482-10-8