[1] Brigham & Womens Hosp, Harvard Med Sch, Dept Surg, Div Colorectal Surg, Boston, MA USA
[2] Univ Virginia Hlth Syst, Dept Surg, Charlottesville, VA USA
[3] Duke Univ Med Ctr Lib, Duke Univ Sch Med, Durham, NC USA
[4] McGill Univ, Dept Surg, Montreal, PQ, Canada
[5] Univ Hosp Cleveland, Med Ctr, Dept Surg, Cleveland Hts, OH USA
[6] Univ Chicago, Pritzker Sch Med, Dept Surg, Chicago, IL USA
[7] Rutgers State Univ, Sect Colorectal Surg, New Brunswick, NJ USA
[8] Cleveland Clin Fdn, Cleveland Clin, Dept Colorectal Surg, Cleveland Hts, OH USA
[9] Univ Cincinnati, Coll Med Surg Colon & Rectal, Div Colon & Rectal Surg, 222 Piedmont 7000, Cincinnati, OH 45219 USA