Schäfer, Valentin Sebastian
Weiß, Katharina
Krause, Andreas
Schmidt, Wolfgang Andreas
Article History
Received: 26 September 2017
Revised: 27 February 2018
Accepted: 2 April 2018
First Online: 14 April 2018
Compliance with ethical standards
: This work was carried out in accordance with the Declaration of Helsinki. The ethics committee of the Berlin board of physicians (Berliner Ärztekammer) approved the study protocol (Eth-23-16).
: None.