[1] Univ Calif Davis, Dept Pediat, Sacramento, CA 95817 USA
[2] Univ Calif Davis, Dept Publ Hlth Sci, Sacramento, CA 95817 USA
[3] Univ Calif Davis, Dept Emergency Med, Sacramento, CA 95817 USA
[4] Univ Calif Davis, Dept Internal Med, Sacramento, CA 95817 USA
[5] Univ Calif Davis, Dept Family Practice & Community Med, Sacramento, CA 95817 USA