Consensus statement from the BJA Workshop on Cancer and Anaesthesia - Buggy, DJ; Borgeat, A; Cata, J; Doherty, DG; Doornebal, CW; Forget, P; Gottumukkala, V; Gottschalk, A; Gupta, A; Gupta, K; Hales, TG; Hemmings, HC; et al. (BRITISH JOURNAL OF ANAESTHESIA, 2015)