Kagan, Karl Oliver https://orcid.org/0000-0003-1497-5143
Sonek, Jiri
Sroka, Andreas
Abele, Harald
Wagner, Philipp
Prodan, Natalia
Hoopmann, Markus
Article History
Received: 20 July 2018
Accepted: 17 November 2018
First Online: 5 December 2018
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were 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. This is a secondary analysis of a randomized controlled study at the University of Tübingen. Approval for the prospective study was obtained from the local ethics committee (no. 572/2015BO1). The original study was registered in the International Standard Randomized Controlled Trial Number registry (ISRCTN no. 11174071). Approval for the retrospective study was also obtained from the local ethics committee (no. 531/2018BO2).