1. Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California
2. Duke University School of Medicine, Durham, North Carolina
3. Department of Pediatrics, Boston University Chobanian and Avedisian School of Medicine, Boston, Massachusetts
4. Department of General Internal Medicine at UCLA, Los Angeles, California
5. Institute for Social Research, University of Michigan, Ann Arbor
6. Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles
7. Department of Health Policy and Management, UCLA Fielding School of Public Health, University of California, Los Angeles