1. Primary Care Research Unit of Salamanca (APISAL), Salamanca Primary Care Management, Institute of Biomedical Research of Salamanca (IBSAL), 37005 Salamanca, Spain
2. Castilla and León Health Service-SACYL, Regional Health Management, 37005 Salamanca, Spain
3. Home Hospitalization Service, Marqués de Valdecilla University Hospital, 39008 Santander, Spain
4. Research Network on Chronicity, Primary Care and Health Promotion (RICAPPS), 37005 Salamanca, Spain
5. Department of Medicine, University of Salamanca, 28046 Salamanca, Spain
6. Department of Biomedical and Diagnostic Sciences, University of Salamanca, 37007 Salamanca, Spain
7. Emergency Service, University Hospital of La Paz, 37007 Madrid, Spain