1. a Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts
2. b Department of Psychology, University of Juárez, Gómez Palacio, Durango, Mexico
3. c Department of Nutritional Physiology, National Institute of Medical Sciences and Nutrition (INCMN), Mexico City, Mexico
4. d School of Natural Sciences, University of Querétaro, Mexico
5. e School of Medicine, University of Juárez, Gómez Palacio, Durango, Mexico
6. f Division of Nutritional Sciences, Cornell University, Ithaca, New York