{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T11:24:00Z","timestamp":1792063440027,"version":"4.4.0"},"reference-count":49,"publisher":"Springer Science and Business Media LLC","issue":"12","license":[{"start":{"date-parts":[[2009,3,4]],"date-time":"2009-03-04T00:00:00Z","timestamp":1236124800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.springer.com\/tdm"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Rheumatol Int"],"published-print":{"date-parts":[[2009,10]]},"DOI":"10.1007\/s00296-009-0873-z","type":"journal-article","created":{"date-parts":[[2009,3,3]],"date-time":"2009-03-03T13:29:22Z","timestamp":1236086962000},"page":"1423-1429","source":"Crossref","is-referenced-by-count":24,"title":["Two distinct patterns of ankylosing spondylitis in Moroccan patients"],"prefix":"10.1007","volume":"29","author":[{"given":"Laila El","family":"Mansouri","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachid","family":"Bahiri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatima Ezzahra","family":"Abourazzak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Radouan","family":"Abouqal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Najia","family":"Hajjaj-Hassouni","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2009,3,4]]},"reference":[{"issue":"6","key":"873_CR1","first-page":"1121","volume":"29","author":"MC Creemers","year":"2002","unstructured":"Creemers MC (2002) Ankylosing spondylitis: what do we really know about the onset and progression of this disease? J Rheumatol 29(6):1121\u20131123","journal-title":"J Rheumatol"},{"issue":"3","key":"873_CR2","doi-asserted-by":"crossref","first-page":"401","DOI":"10.1016\/j.berh.2006.02.001","volume":"20","author":"J Sieper","year":"2006","unstructured":"Sieper J, Rudwaleit M, Khan MA, Braun J (2006) Concepts and epidemiology of spondyloarthritis. Best Pract Res Clin Rheumatol 20(3):401\u2013417. doi: 10.1016\/j.berh.2006.02.001","journal-title":"Best Pract Res Clin Rheumatol"},{"key":"873_CR3","doi-asserted-by":"crossref","first-page":"753","DOI":"10.1016\/S0889-857X(05)70040-5","volume":"24","author":"CS Lau","year":"1998","unstructured":"Lau CS, Burgos-Vargas R, Louthrenoo W, Mok MY, Wordsworth P, Zeng QY (1998) Features of spondyloarthritis around the world. Rheum Dis Clin North Am 24:753\u2013770. doi: 10.1016\/S0889-857X(05)70040-5","journal-title":"Rheum Dis Clin North Am"},{"issue":"3 Suppl","key":"873_CR4","doi-asserted-by":"crossref","first-page":"iii8","DOI":"10.1136\/ard.61.suppl_3.iii8","volume":"61","author":"J Sieper","year":"2002","unstructured":"Sieper J, Braun J, Rudwaleit M, Boonen A, Zink A (2002) Ankylosing spondylitis: an overview. Ann Rheum Dis 61(3 Suppl):iii8\u2013iii18","journal-title":"Ann Rheum Dis"},{"issue":"20","key":"873_CR5","doi-asserted-by":"crossref","first-page":"1459","DOI":"10.1016\/S0755-4982(04)98954-3","volume":"33","author":"A El Maghraoui","year":"2004","unstructured":"El Maghraoui A (2004) Ankylosing spondylitis. Presse Med 33(20):1459\u20131464. doi: 10.1016\/S0755-4982(04)98954-3","journal-title":"Presse Med"},{"key":"873_CR6","first-page":"1649","volume":"17","author":"R Will","year":"1990","unstructured":"Will R, Edmunds L, Elswood J, Calin A (1990) Is there sexual inequality in ankylosing spondylitis? A study of 498 women and 1202 men. J Rheumatol 17:1649\u20131652","journal-title":"J Rheumatol"},{"key":"873_CR7","doi-asserted-by":"crossref","first-page":"663","DOI":"10.1016\/S0889-857X(05)70036-3","volume":"24","author":"S Linden van der","year":"1998","unstructured":"van der Linden S, van der Heijde D (1998) Ankylosing spondylitis. Clinical features. Rheum Dis Clin North Am 24:663\u2013676. doi: 10.1016\/S0889-857X(05)70036-3","journal-title":"Rheum Dis Clin North Am"},{"key":"873_CR8","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1093\/oso\/9780192627490.003.0002","volume-title":"The spondyloarthritides","author":"MA Khan","year":"1998","unstructured":"Khan MA (1998) A worldwide overview: the epidemiology of HLA-B27 and associated spondyloarthritides. In: Calin A, Taurog JD (eds) The spondyloarthritides. Oxford University Press, Oxford, pp 17\u201326"},{"issue":"1","key":"873_CR9","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/j.semarthrit.2007.01.003","volume":"37","author":"SC Ng","year":"2007","unstructured":"Ng SC, Liao Z, Yu DT, Chan ES, Zhao L, Gu J (2007) Epidemiology of spondyloarthritis in the People\u2019s Republic of China: review of the literature and commentary. Semin Arthritis Rheum 37(1):39\u201347. doi: 10.1016\/j.semarthrit.2007.01.003","journal-title":"Semin Arthritis Rheum"},{"issue":"8","key":"873_CR10","doi-asserted-by":"crossref","first-page":"1309","DOI":"10.1093\/rheumatology\/kem084","volume":"46","author":"E Collantes","year":"2007","unstructured":"Collantes E, Zarco P, Mu\u00f1oz E, Juanola X, Mulero J, Fern\u00e1ndez-Sueiro JL et al (2007) Disease pattern of spondyloarthropathies in Spain: description of the first national registry (REGISPONSER) extended report. Rheumatology (Oxford) 46(8):1309\u20131315. doi: 10.1093\/rheumatology\/kem084","journal-title":"Rheumatology (Oxford)"},{"issue":"1","key":"873_CR11","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1080\/03009740600904243","volume":"36","author":"R Angelis De","year":"2007","unstructured":"De Angelis R, Salaffi F, Grassi W (2007) Prevalence of spondyloarthropathies in an Italian population sample: a regional community-based study. Scand J Rheumatol 36(1):14\u201321. doi: 10.1080\/03009740600904243","journal-title":"Scand J Rheumatol"},{"issue":"8","key":"873_CR12","doi-asserted-by":"crossref","first-page":"741","DOI":"10.1136\/ard.62.8.741","volume":"62","author":"A Boonen","year":"2003","unstructured":"Boonen A, van der Heijde D, Landew\u00e9 R, Guillemin F, Spoorenberg A, Schouten H et al (2003) Costs of ankylosing spondylitis in three European countries: the patient\u2019s perspective. Ann Rheum Dis 62(8):741\u2013747. doi: 10.1136\/ard.62.8.741","journal-title":"Ann Rheum Dis"},{"issue":"5","key":"873_CR13","doi-asserted-by":"crossref","first-page":"615","DOI":"10.1093\/rheumatology\/keh133","volume":"43","author":"Y Alamanos","year":"2004","unstructured":"Alamanos Y, Papadopoulos NG, Voulgari PV, Karakatsanis A, Siozos C, Drosos AA (2004) Epidemiology of ankylosing spondylitis in Northwest Greece, 1983\u20132002. Rheumatology (Oxford) 43(5):615\u2013618. doi: 10.1093\/rheumatology\/keh133","journal-title":"Rheumatology (Oxford)"},{"issue":"2","key":"873_CR14","first-page":"289","volume":"33","author":"G Kobelt","year":"2006","unstructured":"Kobelt G, Andlin-Sobocki P, Maksymowych WP (2006) Costs and quality of life of patients with ankylosing spondylitis in Canada. J Rheumatol 33(2):289\u2013295","journal-title":"J Rheumatol"},{"issue":"4","key":"873_CR15","doi-asserted-by":"crossref","first-page":"354","DOI":"10.1097\/00002281-200207000-00004","volume":"14","author":"MA Brown","year":"2002","unstructured":"Brown MA, Crane AM, Wordsworth BP (2002) Genetic aspects of susceptibility, severity, and clinical expression in ankylosing spondylitis. Curr Opin Rheumatol 14(4):354\u2013360. doi: 10.1097\/00002281-200207000-00004","journal-title":"Curr Opin Rheumatol"},{"issue":"6","key":"873_CR16","first-page":"420","volume":"60","author":"N Hajjaj-Hassouni","year":"1993","unstructured":"Hajjaj-Hassouni N, Maetzel A, Dougados M, Amor B (1993) Comparison of patients evaluated for spondylarthropathy in France and Morocco. Rev Rhum Ed Fr 60(6):420\u2013425","journal-title":"Rev Rhum Ed Fr"},{"issue":"2","key":"873_CR17","first-page":"93","volume":"63","author":"P Claudepierre","year":"1996","unstructured":"Claudepierre P, Gueguen A, Ladjouze A, Hajjaj Hassouni N, Sellam S, Amor B, Dougadous M (1996) Particularit\u00e9s des formes de debut juvenile au sein des spondylarthropathies au Maghreb. Rev Rhum Ed Fr 63(2):93\u201397","journal-title":"Rev Rhum Ed Fr"},{"issue":"12","key":"873_CR18","doi-asserted-by":"crossref","first-page":"1139","DOI":"10.1093\/rheumatology\/34.12.1139","volume":"34","author":"P Claudepierre","year":"1995","unstructured":"Claudepierre P, Gueguen A, Ladjouze A, Hajjaj-Hassouni N, Sellami S, Amor B, Dougados M (1995) Predictive factors of severity of spondyloarthropathy in North Africa. Br J Rheumatol 34(12):1139\u20131145. doi: 10.1093\/rheumatology\/34.12.1139","journal-title":"Br J Rheumatol"},{"issue":"5","key":"873_CR19","doi-asserted-by":"crossref","first-page":"660","DOI":"10.1007\/s10067-005-0131-z","volume":"25","author":"J Zochling","year":"2006","unstructured":"Zochling J, Bohl-B\u00fchler MH, Baraliakos X, Feldtkeller E, Braun J (2006) Infection and work stress are potential triggers of ankylosing spondylitis. Clin Rheumatol 25(5):660\u2013666. doi: 10.1007\/s10067-005-0131-z","journal-title":"Clin Rheumatol"},{"key":"873_CR20","doi-asserted-by":"crossref","first-page":"361","DOI":"10.1002\/art.1780270401","volume":"27","author":"S Linden Van der","year":"1984","unstructured":"Van der Linden S, Valkenburg HA, Cats A (1984) Evaluation of diagnostic criteria for ankylosing spondylitis. A proposal for modification of the New York criteria. Arthritis Rheum 27:361\u2013368. doi: 10.1002\/art.1780270401","journal-title":"Arthritis Rheum"},{"key":"873_CR21","doi-asserted-by":"crossref","first-page":"584","DOI":"10.1136\/ard.28.6.584","volume":"28","author":"IF Macrae","year":"1969","unstructured":"Macrae IF, Wright V (1969) Measurement of back movement. Ann Rheum Dis 28:584\u2013589. doi: 10.1136\/ard.28.6.584","journal-title":"Ann Rheum Dis"},{"key":"873_CR22","first-page":"247","volume":"10","author":"PN Hollingsworth","year":"1983","unstructured":"Hollingsworth PN, Cheah PS, Dawkins RL, Owen ET, Calin A, Wood PH (1983) Observer variation in grading sacroiliac radiographs in HLA-B27 positive individuals. J Rheumatol 10:247\u2013254","journal-title":"J Rheumatol"},{"key":"873_CR23","doi-asserted-by":"crossref","first-page":"113","DOI":"10.3109\/03009748409100373","volume":"13","author":"N Bellamy","year":"1984","unstructured":"Bellamy N, Newhook L, Rooney PJ et al (1984) Perception\u2014a problem in the grading of sacro-iliac joint radiographs. Scand J Rheumatol 13:113\u2013120. doi: 10.3109\/03009748409100373","journal-title":"Scand J Rheumatol"},{"key":"873_CR24","first-page":"453","volume":"17","author":"PH Bennett","year":"1967","unstructured":"Bennett PH, Burch TA (1967) New York symposium on population studies in the rheumatic diseases: new diagnostic criteria. Bull Rheum Dis 17:453\u2013458","journal-title":"Bull Rheum Dis"},{"issue":"2","key":"873_CR25","doi-asserted-by":"crossref","first-page":"102","DOI":"10.1007\/s11926-004-0054-8","volume":"6","author":"M Grigoryan","year":"2004","unstructured":"Grigoryan M, Roemer FW, Mohr A, Genant HK (2004) Imaging in spondyloarthropathies. Curr Rheumatol Rep 6(2):102\u2013109. doi: 10.1007\/s11926-004-0054-8","journal-title":"Curr Rheumatol Rep"},{"key":"873_CR26","unstructured":"Rostom S, Benbouazza K, Bahiri R, Lazrak N, Jroundi I, Abouqal R et al (2005) Adaptation transculturelle et validation de la version arabe marocaine dialectale du Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) dans la spondylarhtrite ankylosante (abstract). 18\u00b0 congres of SFR, Paris"},{"key":"873_CR27","unstructured":"Rostom S, Benbouazza K, Bahiri R, Lazrak N, Jroundi I, Abouqal R et al (2005) Adaptation transculturelle et validation de la version arabe marocaine dialectale du Bath Ankylosing Spondylitis Functional Index (BASFI) dans la spondylarhtrite ankylosante (abstract). 18\u00b0 congres of SFR, Paris"},{"key":"873_CR28","first-page":"2286","volume":"21","author":"S Garrett","year":"1994","unstructured":"Garrett S, Jenkinson T, Kennedy LG, Whitelock H, Gaisford P, Calin A (1994) A new approach to defining disease status in ankylosing spondylitis: the Bath Ankylosing Spondylitis Disease Activity Index. J Rheumatol 21:2286\u20132291","journal-title":"J Rheumatol"},{"key":"873_CR29","first-page":"2281","volume":"21","author":"A Calin","year":"1994","unstructured":"Calin A, Garrett S, Whitelock H, Kennedy LG, O\u2019Hea J, Mallorie P, Jenkinson T (1994) A new approach to defining functional ability in ankylosing spondylitis: the development of the Bath Ankylosing Spondylitis Functional Index. J Rheumatol 21:2281\u20132285","journal-title":"J Rheumatol"},{"key":"873_CR30","volume-title":"Cluster analysis","author":"E Brian","year":"2001","unstructured":"Brian E, Landau S, Leese M (2001) Cluster analysis. Edward Arnold, London"},{"issue":"1","key":"873_CR31","first-page":"120","volume":"25","author":"M \u00d8stensen","year":"1998","unstructured":"\u00d8stensen M, \u00d8stensen H (1998) Ankylosing spondylitis\u2014the female aspect. J Rheumatol 25(1):120\u2013124","journal-title":"J Rheumatol"},{"key":"873_CR32","doi-asserted-by":"crossref","first-page":"1687","DOI":"10.1016\/S0140-6736(99)03219-5","volume":"354","author":"A Calin","year":"1999","unstructured":"Calin A, Brophy S, Blake D (1999) Impact of sex on inheritance of ankylosing spondylitis: a cohort study. Lancet 354:1687\u20131690. doi: 10.1016\/S0140--6736(99)03219-5","journal-title":"Lancet"},{"issue":"5","key":"873_CR33","doi-asserted-by":"crossref","first-page":"633","DOI":"10.1136\/ard.2006.060293","volume":"66","author":"W Lee","year":"2007","unstructured":"Lee W, Reveille JD, Davis JC Jr, Learch TJ, Ward MM, Weisman MH (2007) Are there gender differences in severity of ankylosing spondylitis? Results from the PSOAS cohort. Ann Rheum Dis 66(5):633\u2013638. doi: 10.1136\/ard.2006.060293","journal-title":"Ann Rheum Dis"},{"key":"873_CR34","first-page":"305","volume":"35","author":"F Onen","year":"2008","unstructured":"Onen F, Akar S, Birlik M, Sari I, Khan MA, Gurler O, Ergor A, Manisali M, Akkoc N (2008) Prevalence of ankylosing spondylitis and related spondyloarthritides in an urban area of Izmir, Turkey. J Rheumatol 35:305\u2013309","journal-title":"J Rheumatol"},{"key":"873_CR35","first-page":"976","volume":"74","author":"R Younsi","year":"2007","unstructured":"Younsi R, Azrib S, Aitouazar M, Harifi G, EL Hassani S (2007) Evaluation de l\u2019incidence du g\u00e8ne HLA-B27 chez le patient atteint de spondylarthrite ankylosante au Maroc. Rev Rhum 74:976\u20131037 (absract)","journal-title":"Rev Rhum"},{"key":"873_CR36","doi-asserted-by":"crossref","first-page":"704","DOI":"10.1056\/NEJM197304052881403","volume":"288","author":"L Schlosstein","year":"1973","unstructured":"Schlosstein L, Terasaki PJ, Bluestone R, Pearson CM (1973) High association of an HLA antigen, w27, with ankylosing spondylitis. N Engl J Med 288:704\u2013706","journal-title":"N Engl J Med"},{"key":"873_CR37","doi-asserted-by":"crossref","first-page":"904","DOI":"10.1016\/S0140-6736(73)91360-3","volume":"1","author":"DA Brewerton","year":"1973","unstructured":"Brewerton DA, Caffrey M, Nicholls A, Walters D, James DC, Sturrock RD (1973) Ankylosing spondylitis and HLA-B27. Lancet 1:904\u2013907. doi: 10.1016\/S0140-6736(73)91360-3","journal-title":"Lancet"},{"key":"873_CR38","first-page":"247","volume":"28","author":"SJ Choi","year":"1987","unstructured":"Choi SJ, Park MH (1987) HLA-B27 frequency in Korean patients with ankylosing spondylitis. Seoul J Med 28:247\u2013250","journal-title":"Seoul J Med"},{"key":"873_CR39","doi-asserted-by":"crossref","first-page":"1526","DOI":"10.1093\/rheumatology\/keh373","volume":"43","author":"HJ Baek","year":"2004","unstructured":"Baek HJ, Shin KC, Lee YJ, Kang SW, Lee EB, Yoo CD, Song YW (2004) Clinical features of adult-onset ankylosing spondylitis in Korean patients: patients with peripheral joint disease (PJD) have less severe spinal disease course than those without PJD. Rheumatology 43:1526\u20131531. doi: 10.1093\/rheumatology\/keh373","journal-title":"Rheumatology"},{"key":"873_CR40","doi-asserted-by":"crossref","first-page":"1565","DOI":"10.1093\/rheumatology\/keh386","volume":"43","author":"LP Robertson","year":"2004","unstructured":"Robertson LP, Davis MJ (2004) A longitudinal study of disease activity and functional status in a hospital cohort of patients with ankylosing spondylitis. Rheumatology 43:1565\u20131568. doi: 10.1093\/rheumatology\/keh386","journal-title":"Rheumatology"},{"issue":"Suppl 1","key":"873_CR41","first-page":"A306","volume":"41","author":"S Pavy","year":"2002","unstructured":"Pavy S, Brophy S, Hickey S, Calin A (2002) Iritis: is it a predictor of long-term outcome in ankylosing spondylitis? Rheumatology 41(Suppl 1):A306","journal-title":"Rheumatology"},{"issue":"3","key":"873_CR42","doi-asserted-by":"crossref","first-page":"571","DOI":"10.1016\/j.berh.2006.03.001","volume":"20","author":"JA Smith","year":"2006","unstructured":"Smith JA, M\u00e4rker-Hermann E, Colbert RA (2006) Pathogenesis of ankylosing spondylitis: current concepts. Best Pract Res Clin Rheumatol 20(3):571\u2013579. doi: 10.1016\/j.berh.2006.03.001","journal-title":"Best Pract Res Clin Rheumatol"},{"issue":"10","key":"873_CR43","first-page":"2283","volume":"28","author":"S Brophy","year":"2001","unstructured":"Brophy S, Calin A (2001) Ankylosing spondylitis: interaction between genes, joints, age at onset, and disease expression. J Rheumatol 28(10):2283\u20132288","journal-title":"J Rheumatol"},{"issue":"12","key":"873_CR44","doi-asserted-by":"crossref","first-page":"2081","DOI":"10.1007\/s10067-007-0622-1","volume":"26","author":"H Rkain","year":"2007","unstructured":"Rkain H, Allali F, Bentalha A, Lazrak N, Abouqal R, Hajjaj-Hassouni N (2007) Socioeconomic impact of ankylosing spondylitis in Morocco. Clin Rheumatol 26(12):2081\u20132088. doi: 10.1007\/s10067-007-0622-1","journal-title":"Clin Rheumatol"},{"issue":"3","key":"873_CR45","doi-asserted-by":"crossref","first-page":"445","DOI":"10.1002\/art.21174","volume":"53","author":"M Stone","year":"2005","unstructured":"Stone M, Warren RW, Bruckel J, Cooper D, Cortinovis D, Inman RD (2005) Juvenile-onset ankylosing spondylitis is associated with worse functional outcomes than adult-onset ankylosing spondylitis. Arthritis Rheum 53(3):445\u2013451. doi: 10.1002\/art.21174","journal-title":"Arthritis Rheum"},{"issue":"4","key":"873_CR46","doi-asserted-by":"crossref","first-page":"305","DOI":"10.1099\/0022-1317-49-4-305","volume":"49","author":"A Ebringer","year":"2000","unstructured":"Ebringer A, Wilson C (2000) HLA molecules, bacteria and autoimmunity. J Med Microbiol 49(4):305\u2013311","journal-title":"J Med Microbiol"},{"issue":"4","key":"873_CR47","doi-asserted-by":"crossref","first-page":"400","DOI":"10.1097\/01.bor.0000163447.44037.c4","volume":"17","author":"TH Kim","year":"2005","unstructured":"Kim TH, Uhm WS, Inman RD (2005) Pathogenesis of ankylosing spondylitis and reactive arthritis. Curr Opin Rheumatol 17(4):400\u2013405. doi: 10.1097\/01.bor.0000163447.44037.c4","journal-title":"Curr Opin Rheumatol"},{"issue":"10","key":"873_CR48","doi-asserted-by":"crossref","first-page":"762","DOI":"10.1016\/j.revmed.2006.05.005","volume":"27","author":"E Toussirot","year":"2006","unstructured":"Toussirot E, Wendling D (2006) The immunogenetics of ankylosing spondylitis. Rev Med Interne 27(10):762\u2013771. doi: 10.1016\/j.revmed.2006.05.005","journal-title":"Rev Med Interne"},{"issue":"2","key":"873_CR49","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1093\/rheumatology\/kem269","volume":"47","author":"MA Brown","year":"2008","unstructured":"Brown MA (2008) Breakthroughs in genetic studies of ankylosing spondylitis. Rheumatology (Oxford) 47(2):132\u2013137. doi: 10.1093\/rheumatology\/kem269","journal-title":"Rheumatology (Oxford)"}],"container-title":["Rheumatology International"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/link.springer.com\/content\/pdf\/10.1007\/s00296-009-0873-z.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/link.springer.com\/article\/10.1007\/s00296-009-0873-z\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/link.springer.com\/content\/pdf\/10.1007\/s00296-009-0873-z","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,3,11]],"date-time":"2024-03-11T01:19:19Z","timestamp":1710119959000},"score":1,"resource":{"primary":{"URL":"http:\/\/link.springer.com\/10.1007\/s00296-009-0873-z"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,3,4]]},"references-count":49,"journal-issue":{"issue":"12","published-print":{"date-parts":[[2009,10]]}},"alternative-id":["873"],"URL":"https:\/\/doi.org\/10.1007\/s00296-009-0873-z","relation":{},"ISSN":["0172-8172","1437-160X"],"issn-type":[{"value":"0172-8172","type":"print"},{"value":"1437-160X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2009,3,4]]}}}