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Background:Ankylosingspondylitis(AS)isachronicin-flammatorydiseasethataffectsthejointsbetweenthevertebraeofthespine,andthejointsbetweenthespineandthepelvis.Iteventuallycausestheaffectedvertebraetofuseorgrowtogether.Thespecialcauseandtherapyforthisdiseasei