1. Aiken LH, Sloane DM, Bruyneel L, Van den Heede K, Sermeus W; RN4CAST Consortium (2013) Nurses' reports of working conditions and hospital quality of care in 12 countries in Europe. Int J Nurs Stud 50: 143–153
2. Aiken LH, Sloane DM, Bruyneel L et al; RN4CAST consortium (2014) Nurse staffing and education and hospital mortality in nine European countries: a retrospective observational study. Lancet 383 (9931):1824–1830
3. Aylin P, Alexandrescu R, Jen MH, Mayer EK, Bottle A (2013) Day of week of procedure and 30 day mortality for elective surgery: retrospective analysis of hospital episode statistics. BMJ 346: f2424
4. Bause H, Burchardi H, Falke K, Fischer K, Forst H, Kuhlen R, Prien T, Putensen C, Quintel M, Schulte am Esch J (2002) Intermediate Care: Entwicklung, Definition, Ausstattung, Organisation und mögliche Lösungen. Anästh Intensivmed 2002; 43:536–541
5. Bellomo R, Goldsmith D, Uchino S, Buckmaster J, Hart G, Opdam H, Silvester W, Doolan L, Gutteridge G (2005) A before and after trial of the effect of a high-dependency unit on post-operative morbidity and mortality. Crit Care Resusc. 7:16–21