Full text: Available Index: LILACS (Americas) Main subject: Arthritis, Juvenile / Spondylitis, Ankylosing Type of study: Diagnostic study / Etiology study Limits: Adolescent / Humans Language: Spanish Journal: Rev. chil. reumatol Journal subject: Rheumatology Year: 2009 Type: Article / Congress and conference Affiliation country: Chile Institution/Affiliation country: Hospital de Carabineros/CL