Received: 14 May 2020
Accepted: 15 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: Ethical approval has been obtained from the ethical committee of the Hamburg Chamber of Physicians (approval number: PV5770).
: Not applicable, since the manuscript does not contain any person’s data.
: AB has received funding from Roche Pharma. CH has received research grants, congress travel compensations, and salaries for talks from Biogen, Genzyme, Sanofi-Aventis, Bayer Healthcare, Merck, Teva Pharma, Roche Pharma, and Novartis. IK has received speaker honoraria and travel funding from Bayer, Biogen, Novartis, Merck, Sanofi Genzyme, Roche; speaker honoraria from Mylan; travel funding from the Guthy-Jackson Charitable Foundation; consulted for Alexion, Bayer, Biogen, Celgene, Chugai, IQVIA, Novartis, Merck, Roche; and received research support from Chugai, Diamed. KRL, CK, JS, DE, SK, and JK declare that they have no competing interests. ACR was supported by a research grant from the National MS Society, USA (grant no. G-1508-06034).