- Correspondence to Dr Mette Bjørndal Axelsen, Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Copenhagen University Hospital at Glostrup, Nordre Ringvej 57, opgang 5, stuen, Glostrup DK-2600, Denmark;
- Received August 29, 2013
- Revised November 30, 2013
- Accepted December 15, 2013
- First published January 10, 2014.
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