Nurse staffing, nursing assistants and hospital mortality: retrospective longitudinal cohort study
Peter Griffiths, Antonello Maruotti, Alejandra Recio Saucedo, Oliver C Redfern, Jane E Ball, Jim Briggs, Chiara Dall'Ora, Paul E Schmidt, Gary B Smith
BMJ Quality & Safety Aug 2019, 28 (8) 609-617; DOI: 10.1136/bmjqs-2018-008043