Wittenstein, Olaf http://orcid.org/0000-0003-4127-3139
Hiepe, Patrick
Sowa, Lars Henrik
Karsten, Elias
Fandrich, Iris
Dunst, Juergen
Article History
Received: 10 December 2018
Accepted: 25 March 2019
First Online: 29 April 2019
Conflict of interest
: O. Wittenstein has received a speaker honorarium from Brainlab AG. P. Hiepe and L.H. Sowa are employers of Brainlab AG. E. Karsten, I. Fandrich and J. Dunst declare that they have no competing interests.