Nurse staffing levels, missed vital signs observations and mortality in hospital wards: retrospective longitudinal observational study

Peter Griffiths, Jane Ball, Karen Bloor, Dankmar Böhning, Jim Briggs, Chiara Dall'Ora, Anya De Iongh, Jeremy Jones, Caroline Kovacs, Antonello Maruotti, Paul Meredith, Alejandra Recio-Saucedo, David Prytherch, Oliver Redfern, Paul E. Schmidt, Nicky Sinden, Gary Smith