1. Addictive Behaviors Unit, Clinic Hospital; Neuroscience Institute; Barcelona Spain
2. Catalon Agency of Quality and Health Evaluation; Barcelona Spain
3. Biomedical Research Network Centre of Epidemiology and Public Health; Barcelona Spain
4. Sant Pau Biomedical Research Institute; Barcelona Spain
5. Institute of Health and Society; Newcastle University; Newcastle upon Tyne UK
6. Department of Family Medicine, School for Public Health and Primary Care; Maastricht University; Maastricht The Netherlands