Funding for this research was provided by:
National Multiple Sclerosis Society (RG-1507-05433)
Text and Data Mining valid from 2019-09-06
Received: 24 June 2019
Revised: 4 August 2019
Accepted: 6 August 2019
First Online: 6 September 2019
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: This study was conducted in accordance with the standards and approved by local human study committees, and has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All subjects provided informed written consent prior to their inclusion in the study.