1. 1Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY
2. 2Department of Biostatistics, Columbia University Mailman School of Public Health, New York, NY
3. 3U.S. Geological Survey, New England Water Science Center, Pembroke, NH
4. 4Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY
5. 5Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY
6. 6Department of Epidemiology, University of Washington, Seattle, WA
7. 7Department of Medicine, Vagelos College of Physicians and Surgeons, and Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY