Funding for this research was provided by:
Swiss Multiple Sclerosis Society (n.a.)
Received: 27 October 2017
Accepted: 6 August 2018
First Online: 13 August 2018
Ethics approval and consent to participate
: The Swiss Multiple Sclerosis Registry was approved by the Ethics Committee of the Canton of Zurich, Switzerland (Study number PB-2016-00894). Informed consent is obtained from all study participants.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.