- Correspondence to Dr Ludvig M Sollid, Department of Immunology, University of Oslo, Oslo, Norway; ; Dr Frits Koning, Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands;
- Received December 9, 2020
- Revised December 10, 2020
- Accepted December 12, 2020
- First published December 18, 2020.
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