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Contributors AP developed the NfH ELISA and analysed the samples. AP had the idea of presenting this long-term follow-up study, reviewed the clinical data, performed the statistical analysis and wrote the manuscript.
Funding This project was funded by the Dutch MS Research Foundation (grant number 09-538d).
Competing interests None.
Ethics approval VUmc METc, Amsterdam, The Netherlands.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement This is proprietary data that could potentially permit identification of patients if shared on the internet.
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