[1] Univ Calif San Francisco, Div Gen Internal Med, Dept Med, San Francisco, CA 94118 USA
[2] Univ Colorado, Dept Anthropol, Denver, CO 80202 USA
[3] Univ Colorado, Hlth & Behav Sci Program, Denver, CO 80202 USA
[4] Univ Colorado, Dept Math, Denver, CO 80202 USA
[5] Univ Colorado, Hlth Sci Ctr, Dept Prevent Med & Biometr, Boulder, CO 80309 USA
[6] Univ Colorado, Hlth Sci Ctr, Div Hlth Care Policy & Res, Boulder, CO 80309 USA
[7] Univ Colorado, Hlth Sci Ctr, Dept Pediat, Boulder, CO 80309 USA
[8] Denver Hlth, Div Ambulatory Pediat, Denver, CO USA
[9] Colorado Fdn Med Care, Denver, CO USA