1. Faculty of Nursing of Gijón, University of Oviedo, Gijón, Asturias, Spain
2. Health Observatory, Ministry of Health of the Principality of Asturias, Oviedo, Asturias, Spain
3. Public Health Service, Central University Hospital of Asturias, Oviedo, Asturias, Spain
4. Quality and Patient Safety Unit, Cabueñes Hospital, Gijón, Asturias, Spain
5. University Hospital of Burgos, Burgos, Spain
6. OSI Donostialdea, Donostia, Euskadi, Spain