- Correspondence to Dr Miguel A González-Gay, Rheumatology Division, Hospital Universitario Marqués de Valdecilla, IFIMAV, Avenida de Valdecilla, s/n, Santander, Cantabria 39008, Spain;
- Received December 2, 2013
- Revised January 4, 2014
- Accepted January 24, 2014
- First published June 6, 2014.
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