Research recommendation(s) from an individual piece of guidance Guidance: Ex-situ machine perfusion for extracorporeal preservation of livers for transplantation Date issued: 16 January 2019 Research recommendations coming out of this guidance Further research on ex-situ machine perfusion for extracorporeal preservation of livers for transplantation should report the exact method of perfusion used (such ashypothermic or normothermic), graft survival and the use of marginal grafts.