University of Liverpool - Department of Public Health, Policy and Systems, Harvard University - Department of Environmental Health, Harvard University - Department of Environmental Health, Harvard University - Department of Epidemiology, Université Laval, Harvard University - Beth Israel Deaconess Medical Center, Harvard University - Department of Epidemiology, Harvard University - Beth Israel Deaconess Medical Center, Harvard Pilgrim Health Care, Harvard TH Chan School of Public Health - Department of Epidemiology and Harvard University - Harvard TH Chan School of Public Health