1. Department of Environmental and Occupational Health, School of Public Health, University of Nevada, Las Vegas, NV, USA
2. Department of Community Health and Epidemiology, University of Saskatchewan, Saskatoon, Canada
3. Department of Prevention and Community Health, Milken Institute School of Public Health, The George Washington University, Washington, DC, USA
4. Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY, USA