1. Department of Nursing and Physiotherapy, Universidad de León, 24400 Ponferrada, Spain
2. Department of Nursing and Physiotherapy, Universidad de Salamanca, 37008 Salamanca, Spain
3. Faculty of Nursing, Physiotherapy and Podiatry, Universidad Complutense de Madrid, 28040 Madrid, Spain
4. SALBIS Research Group, Department of Nursing and Physiotherapy, Universidad de León, 24400 Ponferrada, Spain