Bednarsch, Jan
Czigany, Zoltan
Heise, Daniel
Zimmermann, Henning
Boecker, Joerg
Ulmer, Tom Florian
Neumann, Ulf Peter
Klink, Christian https://orcid.org/0000-0001-8764-9440
Article History
Received: 20 November 2019
Accepted: 23 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: The need for ethics approval and consent was waived by the Institutional Review Board of the RWTH Aachen University due to the retrospective nature of the study (EK 312/19).
: Not applicable.
: The authors declare that they have no competing interests.