1Department of Global Health and Population, Harvard School of Public Health, Boston, MA, USA
2Department of Biostatistics, Harvard School of Public Health, Boston, MA, USA
3Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA
4Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
5Department of Chronic Diseases and Health Promotion, World Health Organization, Geneva, Switzerland
6Department of Statistics, University of California, Berkeley, CA, USA
7Department of Health Statistics and Informatics, World Health Organization, Geneva, Switzerland
8Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA
9Department of Epidemiology and Biostatistics, School of Public Health Imperial College, London, UK
10MRC-HPA Centre for Environment and Health, Imperial College London, UK