- Correspondence to Professor Désirée van der Heijde, Department of Rheumatology, Leiden University Medical Center, Leiden, 2300 RC, The Netherlands;
- Received 18 October 2017
- Revised 31 October 2017
- Accepted 31 October 2017
- Published in print 9 November 2017.
- Published online 10 November 2017.
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