Gassner, Markus
Schmid-Grendelmeier, Peter
Clot, Bernard
Article History
Received: 28 November 2018
Accepted: 15 April 2019
First Online: 30 September 2019
Conflict of interest
: M. Gassner, P. Schmid-Grendelmeier and B. Clot declare that they have no competing interests.