1. Department of Public Policy, University of California–Los Angeles, 3250 Public Affairs Building, Los Angeles, CA 90095.
2. Tufts University Economics Department, 8 Upper Campus Road, Braker Hall, Medford, MA 02155, Center for Health and Wellbeing, Princeton University, and National Bureau of Economic Research.
3. Center for Developmental Epidemiology, Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 3454, Durham, NC 27710.