Giant Cell ArteritisTemporal ArteriesPolymyalgia RheumaticaArteritisInflammationTakayasu ArteritisArteritis Virus, EquineCytokinesBlood SedimentationVascular HeadachesMice, Inbred C57BLBiopsyPrednisoloneAdrenal Cortex HormonesUltrasonography, Doppler, ColorArterivirus InfectionsRetrospective StudiesProspective StudiesSensitivity and SpecificityInflammation MediatorsPolyarteritis NodosaHLA-B52 AntigenAortic Arch Syndromes