1. Department of Community and Family Medicine, Section of Biostatistics
and Epidemiology, Dartmouth Medical School, Lebanon, New Hampshire, USA
2. Department of Environmental and Community Health, University of Arizona, Tucson, Arizona, USA
3. Department of Natural Resources, Technological Institute of Sonora (ITSON), Ciudad
Obregon, Sonora, Mexico
4. Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, New
Hampshire, USA