1. Genetic and Molecular Epidemiology Group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
2. Cancer Epigenetics Laboratory, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Oviedo, Spain
3. National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland, USA
4. Universidad de Oviedo, Oviedo, Spain
5. Hospital General Universitario de Elche, Elche, Spain
6. Hospital Ramon y Cajal, Madrid, Spain
7. Division of Genetics and Epidemiology, Institute of Cancer Research, Sutton, UK
8. Trace Element Analysis Core, Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire, USA
9. Unidad de Investigación, Hospital Universitario de Canarias, La Laguna, Spain
10. KP Cantor Environmental LLC, Silver Spring, Maryland, USA
11. Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain
12. Epithelial Carcinogenesis Group, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
13. Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
14. Department of Immunology and Oncology, Centro Nacional de Biotecnología/CNB-CSIC, Cantoblanco, Madrid, Spain