1. New York University Rheumatology, New York, NY, USA, and Amsterdam Rheumatology & Immunology Center|Reade, Amsterdam, The Netherlands.
2. Amsterdam Rheumatology & Immunology Center|Reade, Amsterdam, The Netherlands. f.turkstra@reade.nl
3. New York University Rheumatology, New York, NY, USA.
4. New York University School of Medicine, New York, NY, USA.