1 Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY, USA; Department of Environmental Science, Policy, & Management and the School of Public Health, University of California Berkeley, Berkeley, CA, USA. Electronic address: jshearston@berkeley.edu.
2 Department of Epidemiology and Biostatistics, College of Human Medicine, Michigan State University, East Lansing, MI, USA.
3 Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY, USA.
4 Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA.