Impact Of A national enhanced recovery programme on patient outcomes of primary hip replacement: an interrupted time series analysis from England - Garriga, C; Price, A; Prieto-Alhambra, D; Carr, A; Arden, N; Leal, J; Gooberman-Hill, R; Cooper, C; Peat, G; Fitzpatrick, R; Barker, K; Judge, A (European Federation of National Associations of Orthopaedics and Traumatology, 2018)