- Correspondance to Professor Frédéric A Houssiau, Rheumatology Department, Cliniques Universitaires Saint-Luc, Université catholique de Louvain, Brussels 1200, Belgium;
- Received October 28, 2014
- Revised December 9, 2014
- Accepted December 15, 2014
- First published March 10, 2015.
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