Tissue and Organ ProcurementTissue DonorsUnited States Health Resources and Services AdministrationTissue BanksBrain DeathDonor SelectionOrgan TransplantationValue-Based PurchasingTissue and Organ HarvestingWaiting ListsUnited StatesPresumed ConsentCadaverDeathOrgan PreservationDirected Tissue DonationPrinciple-Based EthicsLiver TransplantationKidney TransplantationFacility Regulation and ControlHealth Care RationingTransplantationLiving DonorsGraft SurvivalInformed ConsentEnd Stage Liver DiseaseTransplantsHeart TransplantationEthics, MedicalLiver FailureFamilyDrugs, EssentialRetrospective StudiesRegistriesTime Factors