- Correspondence to Dr Rachel Raanan, Center for Environmental Research and Children's Health (CERCH), UC Berkeley School of Public Health, 1995 University Avenue, Suite 265, Berkeley, CA 94704, USA;
- Received November 26, 2014
- Revised September 15, 2015
- Accepted September 29, 2015
- First published December 3, 2015.
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- Data supplement 1 - Online supplement
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