[1] Atrium Hlth Carolinas Med Ctr, Dept Surg, Div Gastrointestinal & Minimally Invas Surg, Charlotte, NC USA
[2] MIT, Dept Econ, Cambridge, MA USA
[3] Univ Copenhagen, Bispedjerg & Frederiksberg Hosp, Dept Clin Med, Copenhagen, Denmark
[4] Royal Devon & Exeter Hosp, Dept Surg, Div Colorectal Surg, Exeter, Devon, England
[5] Univ Penn Hlth Syst, Div Plast Surg, Philadelphia, PA USA
[6] Ohio State Univ, Wexner Med Ctr, Div Plast & Reconstruct Surg, Columbus, OH USA