1. Faculty of Nursing and Podiatry, Department of Nursing, University of Valencia, Frailty Research Organized Group (FROG), Valencia, Spain
2. School of Nursing, Physiotherapy and Podiatry, Universidad Complutense de Madrid, Madrid, Spain
3. Faculty of Health Sciences, Universidad Rey Juan Carlos, Madrid, Spain
4. University Center of Plasencia, Universidad de Extremadura, Plasencia, Spain
5. Research, Health and Podiatry Group, Department of Health Sciences, Faculty of Nursing and Podiatry, Universidade da Coruña, A Coruña, Spain
6. Antonio Nebrija University, Madrid, Spain
7. Faculty of Sport Sciences, Universidad Europea de Madrid, Villaviciosa de Odón, Madrid, Spain