- Correspondence to Professor Till Uhlig, Department of Rheumatology, National Resource Center for Rehabilitation in Rheumatology, Diakonhjemmet Hospital, Postbox 23 Vinderen, Oslo N-0319, Norway;
- Received November 20, 2012
- Revised January 25, 2013
- Accepted February 3, 2013
- First published February 20, 2013.
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