1. Group of Evaluation of Health Determinants and Health Policies, Department of Basic Sciences, Universitat Internacional de Catalunya, 08195 Sant Cugat del Vallès, Spain
2. Tobacco Control Unit, Cancer Prevention and Control Programme, Catalan Institute of Oncology (ICO), 08908 L’Hospitalet de Llobregat, Spain
3. Cancer Control and Prevention Group, Bellvitge Biomedical Research Institute-IDIBELL, 08908 L’Hospitalet de Llobregat, Spain
4. Cancer Screening Unit, Cancer Prevention and Control Programme, Catalan Institute of Oncology (ICO), 08908 L’Hospitalet de Llobregat, Spain