Article History
Received: 4 September 2019
Accepted: 2 February 2020
First Online: 12 February 2020
Change Date: 9 July 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1007/s10072-021-05413-w
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Literature analysis - no ethical approval required.