1. Primary Health Physician, Aragon Health Service, 50009 Zaragoza, Spain
2. Health Services Research Group (GRISSA), Aragon Health Research Institute, 50009 Zaragoza, Spain
3. Preventive Medicine and Public Health, University of Zaragoza, 50009 Zaragoza, Spain
4. Department of Applied Economy, University of Zaragoza, 50009 Zaragoza, Spain
5. Network for Research on Chronicity, Primary Care, and Health Promotion (RICAPPS), ISCIII, 28029 Madrid, Spain