Jansen, Elena
Hamisch, Christina
Ruess, Daniel
Heiland, Dieter Henrik
Goldbrunner, Roland
Ruge, Maximilian I.
Schnell, Oliver
Grau, Stefan J. http://orcid.org/0000-0002-9742-527X
Article History
Received: 17 September 2019
Revised: 8 October 2019
Accepted: 10 October 2019
First Online: 16 October 2019
Compliance with ethical standards
:
: All authors declare no conflict of interest.
: This is a retrospective study with no study-related procedures involving human participants. The study was approved by the local ethical committees (approval numbers 16-443 (cologne) and 100020/09 (Freiburg)) and is in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.