Funding for this research was provided by:
G. Müller, Munich (?)
Kelm Foundation Zurich (?)
Received: 20 January 2020
Accepted: 27 August 2020
First Online: 15 October 2020
Ethics approval and consent to participate
: An English translation of the ethics approval was submitted alongside the paper. It is the third and currently last protocol version. This amended protocol version was reviewed and approved by the ethics committee of Charité Universitätsmedizin Berlin (Charitéplatz 1, 10117 Berlin) in July 2018, followed by the ethics review boards of the Albert-Ludwigs-Universität Freiburg (Engelberger Strasse 21, 79106 Freiburg) in October 2018 and of the medical association of Baden-Württemberg (Landesärztekammer Baden-Württemberg, Postfach 700361, 70573 Stuttgart) in December 2018. The original protocol was reviewed and approved by the ethics committee of Charité Universitätsmedizin Berlin in December 2016.
: Not applicable
: The authors declare no competing interests. The sponsors of the study are not involved in the design, interpretation, or publication of the data.