- Correspondence to Professor Mikkel Østergaard, Copenhagen Center for Arthritis Research, Center for Rheumatology and Spine Diseases, Glostrup Hospital, Nordre Ringvej 57, Glostrup DK-2600, Denmark;
- Received July 25, 2014
- Revised November 12, 2014
- Accepted November 15, 2014
- First published December 15, 2014.
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