1. Nursing Research Unit, Hospital Universitario de Mostoles, 28935 Madrid, Spain
2. Department of Nursing, School of Health Sciences, Universidad Rey Juan Carlos, 28922 Madrid, Spain
3. Exercise and Sport Sciences, Faculty of Health Sciences, Universidad Francisco de Vitoria, 28223 Madrid, Spain
4. Gregorio Marañón Health Research Institute (IiSGM), Universidad Autonoma de Madrid, 28049 Madrid, Spain