Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01GY1706)
Text and Data Mining valid from 2020-04-16
Received: 23 December 2019
Accepted: 17 March 2020
First Online: 16 April 2020
Ethics approval and consent to participate
: Ethical approval for this study was obtained from the Ethics Committee of the University of Cologne (#17–265). The study is registered in the German Clinical Trials Register (DRKS00012988). All participants signed a declaration of consent.
: Not applicable.
: The authors declare that they have no competing interests.