DOI:
10.1055/s-00000005
Aktuelle Rheumatologie
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References
Poddubnyy D, Brandt H, Vahldiek J. et al.
The frequency of non-radiographic axial spondyloarthritis in relation to symptom duration in patients referred because of chronic back pain: results from the Berlin early spondyloarthritis clinic.
Ann Rheum Dis 2012;
71: 1998-2001. doi:10.1136/annrheumdis-2012-201945
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