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Sairyo              K            ,               Sakai              T            ,               Yasui              N            . Conservative treatment of lumbar spondylolysis in            childhood and adolescence: the radiological signs which predict healing.            J Bone Joint Surg Br 2009; 91:            206\u2013209.","DOI":"10.1302\/0301-620X.91B2.21256"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2.               Schmitt              H            ,               Brocai              DR            ,               Carstens              C            . Long-term review of the lumbar spine in javelin            throwers. J Bone Joint Surg Br 2001;            83: 324\u2013327.","DOI":"10.1302\/0301-620X.83B3.0830324"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3.               Sairyo              K            ,               Sakai              T            ,               Mase              Y            , et al. 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