Strege, Rainer J. http://orcid.org/0000-0003-1871-7045
Kiefer, Reinhard
Herrmann, Manfred http://orcid.org/0000-0003-1872-8406
Article History
Received: 22 August 2019
Accepted: 25 November 2019
First Online: 4 December 2019
Ethics approval and consent to participate
: The study protocol was approved by the Local Ethics Committee of the University of Bremen. All participants were informed about the procedure and gave written informed consent to participate in the study.
: Not applicable. No individual person’s personal details, images or videos are being used in this study.
: The authors declare that they have no competing interests.