Urla, Cristian
Lieber, Justus
Obermayr, Florian
Busch, Andreas
Schweizer, Roland
Warmann, Steven W.
Kirschner, Hans-Joachim
Fuchs, Jörg
Article History
Received: 8 January 2018
Accepted: 26 July 2018
First Online: 15 August 2018
Ethics approval and consent to participate
: The study was approved by the Ethical Committee of the Medical Faculty of the Eberhard-Karls- University of Tübingen (number 470/2015R). According to the German legislation and internal SOP, the retrospective analysis of data of own patients does not require written informed consent of the participants and an approval of the local IRB.
: Not applicable.
: The authors declare that they have no competing interests.
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