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The authors of the paper by Song et al (Knee osteoarthritis. Efficacy of a new method of contrast-enhanced musculoskeletal ultrasonography in detection of synovitis in patients with knee osteoarthritis in comparison with magnetic resonance imaging. Ann Rheum Dis 2008;67:19–25) are listed in the wrong order. The correct order should be:
H Song, CE Althoff, KG Hermann, AK Scheel, T Knetsch, M Schoenharting, C Werner, GR Burmester, M Backhaus.
A corrected PDF is available online at http://ard.bmj.com/cgi/content/full/ard.2006.067462/DC1