1. Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
2. Department of Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, China
3. Department of Epidemiology, School of Public Health, Nanjing Medical University, Nanjing, China
4. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
5. Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA