Living DonorsLiver TransplantationTissue and Organ ProcurementTissue DonorsKidney TransplantationDonor SelectionBrain DeathPresumed ConsentDirected Tissue DonationTissue and Organ HarvestingThird-Party ConsentCadaverAltruismOrgan TransplantationTissue BanksBlood DonorsInformed ConsentWaiting ListsHistocompatibility TestingGraft SurvivalHepatectomyHepatic VeinsFamilyPatient SelectionRetrospective StudiesLiver Failure