Machine perfusion in liver transplantation: practical issues to consider in the design and conduct of a complex multinational interventional trial and the potential impact on the analysis - Chiocchia, V; Nasralla, D; Bradley, A; Burns, R; Dutton, S; Ploeg, R; Friend, P; On behalf of Consortium of Organ Transplantation in Europe (COPE) (Society for Clinical Trials, 2017)