1. Environmental Defense Fund, Washington, District of Columbia, USA
2. Department of Environmental and Occupational Health Sciences, University of Washington School of Public Health, Seattle, Washington, USA
3. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
4. Johns Hopkins Risk Sciences and Public Policy Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
5. Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA