- Correspondence to Professor Ludwig Kappos, Departments of Medicine, Clinical Research, Biomedicine and Biomedical Engineering, University Hospital, Basel 4031, Switzerland;
- Received 25 February 2015
- Revised 30 April 2015
- Accepted 13 May 2015
- Published in print 1 May 2016.
- Published online 14 April 2016.
- Published first 25 June 2015.
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- Data supplement 1 - Online supplement
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