Funding for this research was provided by:
Universität zu Köln (D721133V (postdoc project grant))
Text and Data Mining valid from 2020-02-03
Received: 29 August 2019
Accepted: 13 December 2019
First Online: 3 February 2020
Ethics approval and consent to participate
: The study was conducted with approval of the local ethics committee of the Medical Faculty of the University of Cologne.
: Not applicable.
: The authors declare that they have no competing interests.