1. San Andrés Primary Health Centre, Department Preventive Medicine University Rey Juan Carlos Madrid Spain
2. Jaume I Health Centre, University Rovira i Virgili Tarragona Spain
3. Department of Quantitative Methods for Economics and Management University of Las Palmas Las Palmas de Gran Canaria Canary Islands Spain
4. Section of General Practice and Research Unit for General Practice, Department of Public Health University of Copenhagen Copenhagen Denmark
5. La Marina Health Centre, University of Barcelona Barcelona Spain
6. Via Roma Health Centre, University Institute in Primary Care Research Jordi Gol Barcelona Spain