1. Center for Children’s Environmental Health Research, School of Public Health, University of California, Berkeley, California, USA
2. School of Medicine, University of California, San Francisco, California, USA
3. Clínica de Salud del Valle de Salinas, Salinas, California, USA
4. Division of Environmental and Occupational Disease Control, California Department of Health Services, Oakland, California, USA
5. Center for the Health Assessment of Mothers and Children of Salinas (CHAMACOS), Salinas, California, USA