DOI: 10.1055/s-00023610

Drug Research


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

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