- Correspondence to Professor Désirée van der Heijde, Department of Rheumatology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands;
- Received January 14, 2020
- Revised February 25, 2020
- Accepted February 25, 2020
- First published April 6, 2020.
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