- Correspondence to Lize F D van Vulpen, Van Creveldkliniek, Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Room F.02.127, PO Box 85500, Utrecht 3508 GA, The Netherlands;
- Received February 17, 2015
- Revised March 19, 2015
- Accepted March 29, 2015
- First published April 20, 2015.
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