[1] Univ Wisconsin, Sch Med & Publ Hlth, Dept Pediat, Madison, WI USA
[2] Univ Wisconsin, Dept Biostat & Med Informat, Madison, WI USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pediat, Los Angeles, CA 90095 USA
[4] Univ Calif Los Angeles, Fielding Sch Publ Hlth, Dept Hlth Policy & Management, Los Angeles, CA USA
[5] Virginia Commonwealth Univ, Childrens Hosp Richmond, Richmond, VA USA
[6] Univ Calif Los Angeles, Childrens Discovery & Innovat Inst, Los Angeles Mattel Childrens Hosp, Los Angeles, CA USA
[7] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[8] RAND Corp, RAND Hlth, Santa Monica, CA USA