- Correspondence to Dr Alf Kastbom, Department of Rheumatology, IKE, Pathology building, floor 10, Linköping University Hospital, Linköping SE 581 85, Sweden;
- Received April 8, 2014
- Revised October 31, 2014
- Accepted November 7, 2014
- First published December 30, 2014.
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