[1] Washington Univ, Sch Med, Dept Surg, Div Publ Hlth Sci, 660 S Euclid Ave,Campus Box 8100, St Louis, MO 63110 USA
[2] Northwestern Univ, Feinberg Sch Med, Dept Med Social Sci, 750 N Lake Shore Dr, Chicago, IL 60611 USA
[3] Kaiser Permanente, Div Res, Oakland, CA 94612 USA
[4] H Lee Moffitt Canc Ctr & Res Inst, Dept Hlth Outcomes & Behav, Tampa, FL USA
[5] Univ Delaware, Coll Hlth Sci, Epidemiol Program, Newark, DE 19716 USA
[6] Augusta Univ, Med Coll Georgia, Dept Populat Hlth Sci, Div Epidemiol, 1120 15th St AE-1037, Augusta, GA 30912 USA