1. Department of Nursing, Faculty of Nursing, Universidad Rey Juan Carlos, Madrid, Spain
2. Department of Nursing, Faculty of Nursing, Phisiotherapy and Podiatry, Universidad Complutense de Madrid, Madrid, Spain
3. Faculty of Nursing and Podiatry, Department of Nursing, University of Valencia, Frailty Research Organizaded Group. (FROG), Valencia, Spain
4. Research, Health, and Podiatry Group, Department of Health Sciences, Faculty of Nursing and Podiatry, Industrial Campus of Ferrol, Universidade da Coruña, Ferrol, Spain
5. Faculty of Nursing and Phisiotherapy, University of León, León, Spain