Sensory AidsDurable Medical EquipmentCompetitive BiddingArtificial LimbsTransfer AgreementOrganizational AffiliationGroup StructureProstheses and ImplantsAmputeesUnited States Health Resources and Services AdministrationMedicare AssignmentOrthotic DevicesAcquired Immunodeficiency SyndromeAmputation StumpsHIV InfectionsCommunity Health Services