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The aetiology of ankylosing spondylitis. Ann Rheum Dis 1949; 8: 143-8.","journal-title":"Ann Rheum Dis"},{"key":"ref_2","series-title":"Proceedings third international symposium 1966","first-page":"456","article-title":"Population studies of the mild and variant form of definite AS. There was a tendency for the spinal AS patients to exhibit less restricted spinal and chest mobility compared with the patients suffering from definite AS. Due to the rheumatic diseases","author":"H, Bennet P.","year":"1968","unstructured":"Bennet P H, Wood P H N eds. Population studies of the mild and variant form of definite AS. There was a tendency for the spinal AS patients to exhibit less restricted spinal and chest mobility compared with the patients suffering from definite AS. Due to the rheumatic diseases. Proceedings third international symposium 1966. New York. Amsterdam: Excerpta Medica, 1968: 456-7."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1002\/art.1780260210","article-title":"The natural disease course of ankylosing spondylitis","volume":"26","author":"Carette, S.; Graham, D.; Little, H.; Rubenstein, J.; Rosen, P.","year":"1983","unstructured":"Carette S, Graham D, Little H, Rubenstein J, Rosen P. The natural disease course of ankylosing spondylitis. Arthritis Rheum 1983; 26: 186-90.","journal-title":"Arthritis Rheum"},{"key":"ref_4","first-page":"108","article-title":"low number of patients with spinal AS, however, a statistically significant difference was obtained only for spondylometry flexion (Table 2). Further studies will be required to elucidate the nature of spinal AS, 4","volume":"78","author":"P, Singh R.P.","year":"1982","unstructured":"low number of patients with spinal AS, however, a statistically significant difference was obtained only for spondylometry flexion (Table 2). Further studies will be required to elucidate the nature of spinal AS, 4 Prasad P, Singh R P. Ankylosing spondylitis in Tribalt belt of Chhotanagpur region. J Indian Med Assoc 1982; 78: 108-12.","journal-title":"J Indian Med Assoc; Ankylosing spondylitis in Tribalt belt of Chhotanagpur region"},{"key":"ref_5","article-title":"Ankylosing spondylitis","volume-title":"Copeman's textbook of the rheumatic diseases","author":"H, Moll J.M.","year":"1978","unstructured":"Moll J M H. Ankylosing spondylitis. In: Scott J T, ed. Copeman's textbook of the rheumatic diseases. 5th ed. Edinburgh: Churchill Livingstone, 1978; 511-36. but it is our impression that these cases represent mild and variant expressions of AS. Prospective studies of the subjects studied should also clarify whether or not the spinal x-ray changes increase and","edition":"5th ed"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"237","DOI":"10.1136\/ard.41.3.237","article-title":"Spondylitis erosiva: report on 9 patients","volume":"41","author":"Jajic, I.; Furst, Z.; Vuksic, B.","year":"1982","unstructured":"Jajic I, Furst Z, Vuksic B. Spondylitis erosiva: report on 9 patients. Ann Rheum Dis 1982; 41: 237-41.","journal-title":"Ann Rheum Dis"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1136\/ard.17.2.209","article-title":"Clinical features and course of ankylosing spondylitis. As seen in a follow-up of 222 hospital referred cases","volume":"17","author":"Wilkinson, M.; L, Bywaters E.G.","year":"1958","unstructured":"Wilkinson M, Bywaters E G L. Clinical features and course of ankylosing spondylitis. As seen in a follow-up of 222 hospital referred cases. Ann Rheum Dis 1958; 17: 209-28.","journal-title":"Ann Rheum Dis"},{"issue":"303 4","key":"ref_8","article-title":"Ankylosing spondylitis sine sacroiliitis","volume":"22","author":"Calin, A.","year":"1979","unstructured":"Calin A. Ankylosing spondylitis sine sacroiliitis. Arthritis Rheum 1979; 22: 303 4.","journal-title":"Arthritis Rheum"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"197","DOI":"10.3109\/rhe1.1968.14.issue-1-4.22","article-title":"Diagnostic criteria in spondylarthritis ankylopoietica","volume":"14","author":"Kass, E.","year":"1968","unstructured":"Kass E. Diagnostic criteria in spondylarthritis ankylopoietica. Acta Rheumatol Scand 1968; 14: 197-209.","journal-title":"Acta Rheumatol Scand"},{"key":"ref_10","article-title":"and degenerative changes may be difficult","volume-title":"of a young middle-aged population in Troms0; The prevalence of ankylosing but classical degenerative spinal changes were lacking in our patients. Furthermore, when differentiation from degenerative changes was difficult the spondylitis in males and females","author":"of AS","year":"10","unstructured":"of AS and degenerative changes may be difficult, 10 Gran J T, Husby G, Hordvig M. The prevalence of ankylosing but classical degenerative spinal changes were lacking in our patients. Furthermore, when differentiation from degenerative changes was difficult the spondylitis in males and females of a young middle-aged population in Troms0, northern Norway. Ann Rheum Dis in press."},{"key":"ref_11","article-title":"Radiographic grading of sacroiliitis in Bechterew's changes were recorded as mixtaosteophytes, and syndrome and allied disorders","author":"Dale, K.","year":"1980","unstructured":"Dale K. Radiographic grading of sacroiliitis in Bechterew's changes were recorded as mixtaosteophytes, and syndrome and allied disorders. Scand J Rheumatol 1980; suppl such cases were excluded from the present study. Other disorders which sometimes lead to roent-","journal-title":"Scand J Rheumatol; suppl such cases were excluded from the present study. Other disorders which sometimes lead to roent"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"173","DOI":"10.3109\/03009748409100382","article-title":"The prevalence of HLA B27 in northern Norway","volume":"13","author":"T, Gran J.; S, Mellby A.; G, Husby","year":"1984","unstructured":"Gran J T, Mellby A S, Husby G. The prevalence of HLA B27 in northern Norway. Scand J Rheumatol 1984; 13: 173-6.","journal-title":"Scand J Rheumatol"},{"issue":"28","key":"ref_13","first-page":"584","article-title":"Measurements of back movements. Ann possible excluded in the seven patients studied","volume":"1969","author":"F, Macrae I.; V, Wright","unstructured":"Macrae I F, Wright V. Measurements of back movements. Ann possible excluded in the seven patients studied. Rheum Dis 1969; 28: 584-91.","journal-title":"Rheum Dis"},{"article-title":"the association between spinal AS and B27 cannot be related to the presence of other seronegative spondyloarthropathies, as these dis-","author":"Furthermore","key":"ref_14","unstructured":"Furthermore, the association between spinal AS and B27 cannot be related to the presence of other seronegative spondyloarthropathies, as these dis-"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"136","DOI":"10.1136\/ard.33.2.136","article-title":"Measurements of spinal mobility","volume":"33","author":"D, Hart F.; D, Strickland; P, Cliffe","year":"1974","unstructured":"Hart F D, Strickland D, Cliffe P. Measurements of spinal mobility. Ann Rheum Dis 1974; 33: 136-9.","journal-title":"Ann Rheum Dis"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1093\/rheumatology\/12.3.115","article-title":"The pattern of chest and spinal mobility in ankylosing spondylitis","volume":"12","author":"H, Moll J.M.; V, Wright","year":"1973","unstructured":"Moll J M H, Wright V. The pattern of chest and spinal mobility in ankylosing spondylitis. Rheumatol Rehabil 1973; 12: 115-34.","journal-title":"Rheumatol Rehabil"},{"key":"ref_17","article-title":"orders were carefully looked for and excluded","volume-title":"An epidemiological survey of the clinical signs and the present patient study. To conclude we suggest that the roentgenological findings in these patients represent a mild and symptoms in ankylosing spondylitis. Clin Rheumatol in press","author":"T, Gran J.","unstructured":"orders were carefully looked for and excluded from 17 Gran J T. An epidemiological survey of the clinical signs and the present patient study. To conclude we suggest that the roentgenological findings in these patients represent a mild and symptoms in ankylosing spondylitis. Clin Rheumatol in press."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"240","DOI":"10.7326\/0003-4819-26-2-240","volume":"26","author":"cases","year":"1947","unstructured":"cases. Ann Intern Med 1947; 26: 240-9.","journal-title":"Ann Intern Med"},{"key":"ref_19","first-page":"462","article-title":"Erosive variant form of primary or definite AS. A longituspondylopathy","volume":"39","author":"Courtois, C.; H, Fallet G.; L, Vischer T.; Wettstein, P.","year":"1980","unstructured":"Courtois C, Fallet G H, Vischer T L, Wettstein P. Erosive variant form of primary or definite AS. A longituspondylopathy. 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