Müller, Michael https://orcid.org/0000-0002-8934-9676
Rakow, Anasthasia
Wassilew, Georgi I.
Winkler, Tobias
Perka, Carsten
Article History
Received: 23 May 2019
Accepted: 11 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: The study protocol was approved by institutional ethics committee (EA1/078/13). Consent to participate was not applicable.
: Not applicable
: The authors declare that they have no competing interests.