1. UCLA Schools of Medicine and Public Health, Los Angeles, California
2. UCLA Center for Healthier Children, Families and Communities, Los Angeles, California
3. Developmental Pediatrics, Cedars-Sinai Medical Center, Los Angeles, California
4. The Child and Adolescent Health Measurement Initiative and Kaiser NW Center for Health Research
5. Department of Pediatrics, Vanderbilt University, Nashville, Tennessee, and Penn State University, Philadelphia, Pennsylvania
6. Department of Practice and Research, American Academy of Pediatrics, Elk Grove Village, Illinois