作者单位:Northern Ontario Sch Med, Div Gen Surg, Dept Surg, Sudbury, ON, Canada[1]Univ British Columbia, Div Gen Surg, Dept Surg, Vancouver, BC, Canada[2]Univ Toronto, Div Gen Surg, Dept Surg, Toronto, ON, Canada[3]Mayo Clin, Dept Surg, Mayo 12-11D,200 First St SW, Rochester, MN 55905 USA[4]Dalhousie Univ, Div Gen Surg, Dept Surg, Halifax, NS, Canada[5]