1. Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, New York, USA
2. Department of Biostatistics, Columbia University Mailman School of Public Health, New York, New York, USA
3. Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA
4. Office of Water, U.S. Environmental Protection Agency, Washington, DC, USA
5. United States Public Health Service, Rockville, Maryland, USA
6. Barnard College, Columbia University, New York, New York, USA
7. Department of Epidemiology, Columbia University Mailman School of Public Health, New York, New York, USA