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Financial support and sponsorship
This work was supported by Fondazione Italiana Sclerosi Multipla (ref. 2015/R/16 to PM), by Elena Pecci
research project and Fondazione Careggi Onlus.
Conflicts of interest
The author declared that there are no conflicts of interest.
Ethical approval and consent to participate
Not applicable.
Consent for publication
Not applicable.
Copyright
© The Author(s) 2020.
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