[1] Northwestern Med, Div Gastrointestinal Surg, Chicago, IL USA
[2] Vanderbilt Univ, Dept Surg, Sect Colon & Rectal Surg, Med Ctr, Nashville, TN 37240 USA
[3] Rush Univ, Dept Surg, Div Colon & Rectal Surg, Med Ctr, Chicago, IL 60612 USA
[4] McGill Univ, Jewish Gen Hosp, Montreal, PQ, Canada
[5] Cleveland Clin, Dept Colorectal Surg, Digest Dis Surg Inst, Cleveland, OH 44106 USA
[6] Mayo Clin, Gastroenterol & Hepatol, Rochester, MN USA
[7] Univ Cincinnati, Dept Surg, 231 Bethesda Ave, Cincinnati, OH 45267 USA
[8] Rutgers State Univ, Sect Colorectal Surg, 125 Patterson St, New Brunswick, NJ 08901 USA