1 Health Sciences College, Alfonso X el Sabio University, Madrid, Spain; Alfonso X el Sabio Foundation, Madrid, Spain. Electronic address: iherrpec@uax.es.
2 University Hospital of Burgos, Spain.
3 Faculty of Medicine and Health Sciences, Nursing and Physiotherapy Department, University of Alcalá, Madrid, Spain.
4 Virtual Health Sciences Library of the Balearic Islands (Bibliosalut), Spain.
5 Fdn Jimenez Díaz. Bibliovirtual, Madrid, Spain.
6 University of the Basque Country UPV/EHU, Donostia-San Sebastián, Spain.
7 Nursing and Occupational Therapy College, Nursing Department, University of Extremadura, Cáceres, Spain.