Tissue and Organ ProcurementTissue DonorsBrain DeathUnited States Health Resources and Services AdministrationTissue BanksOrgan TransplantationDonor SelectionValue-Based PurchasingTissue and Organ HarvestingWaiting ListsPresumed ConsentUnited StatesCadaverKidney TransplantationDeathOrgan PreservationDirected Tissue DonationPrinciple-Based EthicsLiver TransplantationTransplantationFacility Regulation and ControlGraft SurvivalHealth Care RationingLiving DonorsTransplantsHeart TransplantationInformed ConsentEnd Stage Liver DiseaseLiver FailureEthics, MedicalGraft RejectionRetrospective StudiesTime FactorsTransplantation, HomologousRegistriesFamilyTreatment OutcomeDrugs, EssentialPatient Selection