[1] NCI, Implementat Sci, Div Canc Control & Populat Sci, NIH, Rockville, MD 20850 USA
[2] Univ Colorado, Dept Family Med, Denver, CO 80202 USA
[3] Univ Colorado, Colorado Hlth Outcomes Res Program, Denver, CO 80202 USA
[4] Washington Univ, Sch Med, Div Emergency Med, St Louis, MO USA
[5] Univ Ottawa, Clin Epidemiol Program, Ottawa Hosp Res Inst, Ottawa, ON K1N 6N5, Canada
[6] Univ Ottawa, Dept Med, Ottawa, ON K1N 6N5, Canada
[7] Univ Colorado, Sch Med, Dept Family Med, Denver, CO USA
[8] Kaiser Permanente Colorado, Inst Hlth Res, CRN Canc Commun Res Ctr, Denver, CO USA
[9] Univ Texas Hlth Sci Ctr Houston, Sch Publ Hlth, Ctr Hlth Promot & Prevent Res, Houston, TX 77030 USA
[10] Prevent Res Ctr, St Louis, MO USA
[11] Washington Univ, Brown Sch, St Louis, MO USA
[12] Washington Univ, Sch Med, Div Publ Hlth Sci, St Louis, MO USA
[13] Washington Univ, Sch Med, Alvin J Siteman Canc Ctr, St Louis, MO USA