[1] Kaiser Permanente, Dept Pediat, Oakland, CA USA
[2] Henry Ford Hosp, Dept Emergency Med, Emergency Med, Detroit, MI 48202 USA
[3] Univ Washington, Dept Family Med, Seattle, WA 98195 USA
[4] Contra Costa Reg Med Ctr, Martinez, CA USA
[5] Univ Calif Davis, Sacramento, CA 95817 USA
[6] Univ Texas Hlth Sci Ctr Houston, Sch Publ Hlth, Hlth Promot & Behav Sci, San Antonio, TX USA
[7] Univ Chicago, Pritzker Sch Med, Dept Med, Chicago, IL 60637 USA
[8] Biol Sci Learning Ctr, Chicago, IL USA