1. a Department of Epidemiology and Biostatistics , University of South Carolina Arnold School of Public Health , Columbia , SC , USA
2. b Division of Global Public Health, Department of Medicine , University of California , San Diego , CA , USA
3. c Center for Urban Epidemiologic Studies , New York Academy of Medicine , New York , NY , USA
4. d Department of Epidemiology , Johns Hopkins Bloomberg School of Public Health , Baltimore , MD , USA
5. e Department of Epidemiology, Center for Social Epidemiology and Population Health, School of Public Health , University of Michigan , Ann Arbor , MI , USA
6. f Department of Epidemiology, Mailman School of Public Health , Columbia University , New York , NY , USA