1. Tobacco Control Unit, Cancer Prevention and Control Program, Institut Català d’Oncologia, WHO Collaborating Center for Tobacco Control, L’Hospitalet de Llobregat, Barcelona, Spain;
2. Cancer Prevention and Control Group, Institut d’Investigació Biomèdica de Bellvitge - IDIBELL, L’Hospitalet de Llobregat, Barcelona, Spain;
3. Department of Clinical Sciences, School of Medicine, Universitat de Barcelona, Barcelona, Spain;
4. Epidemiology Unit, Galician Directorate for Public Health, Galician Health Authority, Xunta de Galicia, Santiago de Compostela, Spain;
5. Department of Preventive Medicine and Public Health, School of Medicine, Universidade de Santiago de Compostela, Santiago de Compostela, Spain;
6. Biomedical Research Centre Network for Epidemiology and Public Health (CIBERESP), Madrid, Spain;
7. Social and Cardiovascular Epidemiology Research Group, School of Medicine, Universidad de Alcalá, Alcalá de Henares, Spain;
8. Agència de Salut Pública de Barcelona, Barcelona, Spain;
9. Institute of Biomedical Research (IIB Sant Pau), Barcelona, Spain