1. Research Unit, Sardenya Primary Health Care Centre-Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona, Spain
2. Teaching Unit of Family Medicine ACEBA, Barcelona, Spain
3. Ibermutuamur, Madrid, Spain
4. Sociedad de Prevención de Ibermutuamur, Madrid, Spain
5. Instituto de Investigación, Hospital Universitario Doce de Octubre, Madrid, Spain