Giant Cell ArteritisTemporal ArteriesPolymyalgia RheumaticaArteritisTakayasu ArteritisArteritis Virus, EquineBlood SedimentationVascular HeadachesBiopsyPrednisoloneAdrenal Cortex HormonesUltrasonography, Doppler, ColorArterivirus InfectionsSensitivity and SpecificityRetrospective StudiesProspective StudiesPolyarteritis NodosaHLA-B52 AntigenAortic Arch Syndromes