1. Center for Health Policy, Columbia University School of Nursing, New York, New York, USA.
2. Nicholas School of the Environment, Duke University, Durham, North Carolina, USA.
3. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA.
4. Department of Epidemiology and Biostatistics, University of South Carolina, Columbia, South Carolina, USA.
5. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.