1. Department of Environmental Health Sciences,
2. Department of Epidemiology, and
3. Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
4. Facultad de Medicina, Universidad Juárez del Estado de Durango, Gómez Palacio Durango, México
5. Secretaría de Salud del Estado de Coahuila, Coahuila, Mexico
6. Instituto Nacional de Salud Pública, Centro de Investigación en Salud Poblacional, Cuernavaca, Morelos, Mexico
7. Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, New York State Department of Health, Albany, New York, USA
8. Department of Environmental Health Sciences, School of Public Health, University at Albany, Albany, New York, USA
9. Johns Hopkins University School of Medicine, Baltimore, Maryland, USA