- Correspondence to Dr Merete Lund Hetland, Center for rheumatology and spine diseases, Glostrup Hospital, Nordre Ringvej 57, DK-2600 Glostrup, Denmark;
- Received November 4, 2013
- Revised January 10, 2014
- Accepted January 24, 2014
- First published February 17, 2014.
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