[1] Univ Penn, Div Colon & Rectal Surg, 4 Silverstein,3400 Spruce St, Philadelphia, PA 19104 USA
[2] Univ Toronto, St Michaels Hosp, Toronto, ON, Canada
[3] Univ Virginia, Div Gen Surg, Charlottesville, VA USA
[4] Univ Virginia, Dept Surg, Charlottesville, VA USA
[5] Univ Penn, Div Gastroenterol, Philadelphia, PA 19104 USA
[6] Vanderbilt Univ, Med Ctr, Div Gastroenterol, Nashville, TN USA
[7] Advocate Illinois Masonic Med Ctr, Colorectal Care, Chicago, IL USA
[8] Cedars Sinai Med Ctr, Dept Surg, Los Angeles, CA 90048 USA
[9] Rutgers Robert Wood Johnson Univ Hosp, Gen Surg, New Brunswick, NJ USA
[10] Univ Penn, Div Plast Surg, Perelman Ctr Adv Med, Philadelphia, PA 19104 USA
[11] Dept Surg, Philadelphia, PA USA