Funding for this research was provided by:
Deutsche Wirbelsäulenstiftung (1/2017)
Albert-Ludwigs-Universität Freiburg (funding programme Open Access Publishing)
Received: 29 July 2019
Accepted: 16 September 2019
First Online: 12 October 2019
Ethics approval and consent to participate
: Approval by the ethics committee of the Albert-Ludwigs-University Freiburg (ID 261/17).
: Consent for publication is given by all authors and the patients, whose MRI-data is exemplarily demonstrated.
: The authors declare that they have no competing interests.