1. Instituto Nacional de Salud Pública Cuernavaca Mexico
2. Hospital General de México ‘Dr. Eduardo Liceaga’ Mexico City Mexico
3. Department of RadiologySechenov First Moscow State Medical University (Sechenov University) Moscow Russia
4. Instituto Mexicano del Seguro Social Mexico City Mexico
5. Instituto Nacional de Ciencias Médicas y Nutrición ‘Salvador Zubirán’ Mexico City Mexico
6. Department of EpidemiologyColorado School of Public HealthUniversity of Colorado Denver, Anschutz Medical Campus Aurora CO USA
7. Department of EpidemiologyUniversity of Michigan School of Public Health Ann Arbor MI USA
8. Department of Nutritional SciencesUniversity of Michigan School of Public Health Ann Arbor MI USA
9. Department of Environmental Health SciencesUniversity of Michigan School of Public Health Ann Arbor MI USA
10. Department of Environmental and Occupational Health SciencesSchool of Public HealthUniversity of Washington Seattle WA USA