1. Health and Environment Program, Natural Resources Defense Council, New York, New York, USA
2. Environmental Health Sciences Department, Mailman School of Public Health, Columbia University, New York, New York, USA
3. Health and Environment Program, Natural Resources Defense Council, San Francisco, California, USA
4. California Department of Public Health, Environmental Health Investigations Branch, Richmond, California, USA
5. Department of Internal Medicine, School of Medicine, University of California Davis, Sacramento, California, USA
6. Pediatric Environmental Health Specialty Unit, California Poison Control System San Francisco, University of California San Francisco, San Francisco, California, USA
7. School of Medicine, University of California San Francisco, San Francisco, California, USA
8. California Department of Public Health, Epidemiology and Prevention for Injury Control Branch, Sacramento, California, USA