Nursing skill mix in European hospitals: cross-sectional study of the association with mortality, patient ratings, and quality of care
Linda H Aiken, Douglas Sloane, Peter Griffiths, Anne Marie Rafferty, Luk Bruyneel, Matthew McHugh, Claudia B Maier, Teresa Moreno-Casbas, Jane E Ball, Dietmar Ausserhofer, Walter Sermeus
BMJ Quality & Safety Jul 2017, 26 (7) 559-568; DOI: 10.1136/bmjqs-2016-005567