1. University Hospital Miguel Servet, Institute for Health Research Aragón, 50009 Zaragoza, Spain
2. Faculty of Nursing, University of Zaragoza, 50005 Zaragoza, Spain
3. Royo Villanova Hospital, Institute for Health Research Aragón, 50009 Zaragoza, Spain
4. Medical Information, Medical Library, University Hospital Miguel Servet, Institute for Health Research Aragón, 50009 Zaragoza, Spain