Tissue DonorsDeltaretrovirus InfectionsDeltaretrovirus AntibodiesNucleic Acid Amplification TechniquesEye BanksDescemet Stripping Endothelial KeratoplastyCorneal TransplantationFetal Tissue TransplantationEpikeratophakiaBrain Tissue TransplantationTissue PreservationBlood DonorsLiving DonorsCorneaCorneal DiseasesEndothelium, CornealGraft SurvivalTransplantation, HomologousGraft RejectionTransplantation, HeterologousRegistriesSwedenTissue and Organ ProcurementLiver TransplantationKidney TransplantationDenmarkTreatment OutcomeTissue and Organ HarvestingHistocompatibility TestingTime FactorsFinlandBone Marrow TransplantationBrain DeathGraft vs Host DiseaseRisk FactorsCadaver