[1] Univ Texas MD Anderson Canc Ctr, Dept Surg Oncol, Houston, TX 77030 USA
[2] Mayo Clin, Div Gastroenterol & Gen Surg, Rochester, MN USA
[3] Indiana Univ, Sch Med, Dept Surg, Indianapolis, IN 46202 USA
[4] Beth Israel Deaconess Med Ctr, Dept Surg, Boston, MA 02215 USA
[5] Washington Univ, Sch Med, Dept Surg, St Louis, MO 63110 USA
[6] Johns Hopkins Univ, Sch Med, Dept Surg, Baltimore, MD 21205 USA