1. Department of Pediatrics, University of California, Los Angeles, UCLA Mattel Children’s Hospital and University of California, Los Angeles, Los Angeles, California
2. Office of Health Assessment and Epidemiology, Los Angeles County Department of Public Health, Los Angeles, California
3. Dornsife College of Letters, Arts and Sciences and Center for Economic and Social Research, University of Southern California, Los Angeles, California
4. Department of Medicine Statistics Core, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California