- Correspondence to Dr Dinesh Khanna, Division of Rheumatology, University of Michigan, Ann Arbor, MI 48109, USA; ; Dr Oliver Distler, Department of Rheumatology, University Hospital Zurich, 8091 Zurich, Switzerland;
- Received December 13, 2019
- Revised February 19, 2020
- Accepted March 9, 2020
- First published April 15, 2020.
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