Al-Hakim, Sara
Schaumann, Andreas
Schneider, Joanna
Schulz, Matthias
Thomale, Ulrich-Wilhelm
Article History
Received: 1 February 2018
Accepted: 16 March 2018
First Online: 26 March 2018
Compliance with ethical standards
: The study was approved by the local ethics committee (approval no. EA2/093/17).
: UWT and AS received lecture honorarium from Miethke Aesculap Comp. in the past. All other authors have no conflict of interest to declare.