Tschiedel, Eva
Goralski, Arkadius
Steinmann, Jörg
Rath, Peter-Michael
Olivier, Margarete
Mellies, Uwe
Kottmann, Tanja
Stehling, Florian
Article History
Received: 8 March 2018
Accepted: 10 July 2019
First Online: 18 July 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Medical Faculty University Duisburg-Essen, Germany, Robert-Koch-Str. 9–11, 45147 Essen, Germany (July 30th 2015). The reference number is 15–6499-BO. We retrospectively evaluated results by chart review. Therefore, written consent of patients was not available. The ethics committee waived this requirement for this study because the data were analysed retrospectively and anonymised. If necessary, the original statement of the ethics committee can be provided.
: Not applicable.
: The authors declare that they have no competing interests.