1. Department of Environmental Health Harvard T.H. Chan School of Public Health Boston MA USA
2. Department of Public Health University of Southern Denmark Odense Denmark
3. Department of Preventive Medicine, Keck School of Medicine University of Southern California Los Angeles CA USA
4. Faculty of Health York University Ontario Canada
5. Centro de Investigacion en Salud Poblacional Instituto Nacional de Salud Publica Cuernavaca Morelos Mexico
6. Department of Biostatistics, School of Public Health University of Michigan Ann Arbor MI USA
7. Faculty of Health Sciences Simon Fraser University British Columbia Canada
8. Department of Biostatistics University of Copenhagen Denmark