1. aLos Angeles County Department of Public Health, Office of Health Assessment and Epidemiology, Los Angeles, California
2. bDepartment of Pediatrics, UCLA Mattel Children’s Hospital
3. cDivision of General Internal Medicine and Health Services Research and National Clinician Scholars Program
4. dDepartment of Medicine Statistics Core, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California
5. eDornsife College of Letters Arts and Sciences, Center for Economic and Social Research, University of Southern California, Los Angeles, California