1General Surgery Department of Chang Gung Memorial Hospital, Chang Gung University, Keelung, Taiwan
2General Surgery Department of Chang Gung Memorial Hospital, Chang Gung University, 5 Fu-Hsing Street, Kwei-Shan, Taoyuan, Taiwan
3Department of Anatomy, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan
4Faculty of Pharmaceutical Sciences, Teikyo University, Sagamihara, Kanagawa 252-5195, Japan
5Boston University School of Medicine, M-1022, 715 Albany Street, Boston, MA 02118, USA