[1] St Vincents Univ Hosp, Div Surg, Dublin, Ireland
[2] Univ Colorado, Denver Hlth Med Ctr, Dept Emergency Med, Sch Med, Denver, CO USA
[3] Colorado Sch Publ Hlth, Dept Epidemiol, Aurora, CO USA
[4] Turku Univ Hosp, Div Digest Surg & Urol, Turku, Finland
[5] Univ Turku, Dept Surg, Turku, Finland
[6] JAMA Surg, Chicago, IL USA