1. Instituto de Investigación Biomédica de Salamanca (IBSAL), University Hospital, 37007 Salamanca, Spain
2. Instituto de Investigación Biomédica de Salamanca (IBSAL), Department of Surgery, University of Salamanca, 37007 Salamanca, Spain
3. Department of Nursing and Physiotherapy, University of Salamanca, 37007 Salamanca, Spain
4. Primary Care, University Hospital “Rio Hortega”, 47012 Valladolid, Spain
5. Instituto de Investigación Biomédica de Salamanca (IBSAL), Department of Medicine and Medical Specialties, Universidad Alcalá de Henares, 28801 Madrid, Spain