- Correspondence to Dr Muhammad S Soyfoo, Department of Rheumatology, Hôpital Erasme, Université libre de Bruxelles, 808 Route de Lennik, Brussels B-1070, Belgium;
- Received December 27, 2012
- Revised November 19, 2013
- Accepted December 14, 2013
- First published January 2, 2014.
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