[1] Univ Wisconsin, Dept Pediat, Sch Med & Publ Hlth, Madison, WI 53792 USA
[2] Univ Wisconsin, Dept Med, Sch Med & Publ Hlth, Madison, WI 53792 USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pediat, Los Angeles, CA 90095 USA
[4] RAND Corp, RAND Hlth, Santa Monica, CA USA
[5] Univ Calif Los Angeles, Dept Hlth Policy, Fielding Sch Publ Hlth, Los Angeles, CA USA
[6] Mattel Childrens Hosp, Childrens Discovery & Innovat Inst, Los Angeles, CA USA
[7] Univ Southern Calif, Keck Sch Med, Dept Pediat, Los Angeles, CA USA
[8] Univ Southern Calif, Keck Sch Med, Dept Anesthesiol Crit Care Med, Los Angeles, CA USA