[1] Brigham & Womens Hosp, Dept Surg, Div Gen & Gastrointestinal Surg, 75 Francis St, Boston, MA 02115 USA
[2] Brigham & Womens Hosp, Ctr Surg & Publ Hlth, 75 Francis St, Boston, MA 02115 USA
[3] Harvard TH Chan Sch Publ Hlth, Dept Epidemiol, Boston, MA USA
[4] Harvard TH Chan Sch Publ Hlth, Ctr Hlth Decis Sci, Boston, MA USA