- Correspondence to Dr Tine Iskov Kopp, The Danish Multiple Sclerosis Registry, Department of Neurology, Rigshospitalet Glostrup, 2600 Glostrup, Denmark;
- Received November 22, 2019
- Revised February 20, 2020
- Accepted February 20, 2020
- First published March 11, 2020.
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