- Correspondence to Dr Karl Skriner, Department of Rheumatology and Clinical Immunology, Charité University Medicine Berlin, corporate member of Free University Berlin, Humboldt University Berlin and Berlin Institute of Health, Berlin 10117, Germany;
- Received December 30, 2019
- Revised April 22, 2020
- Accepted May 18, 2020
- First published June 12, 2020.
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