[1] McGill Univ, Perioperat Care & Outcomes Res PCOR Lab, Montreal, PQ, Canada
[2] McGill Univ, Dept Surg, Montreal, PQ, Canada
[3] McGill Univ, Ctr Outcomes Res & Evaluat CORE, Res Inst, Hlth Ctr, Montreal, PQ, Canada
[4] Sir Mortimer B Davis Jewish Hosp, Div Colon & Rectal Surg, Montreal, PQ, Canada
[5] Montreal Gen Hosp, 1650 Cedar Ave,R2-104, Montreal, PQ H3G 1A4, Canada