Text and Data Mining valid from 2020-01-09
Received: 12 October 2019
Accepted: 18 December 2019
First Online: 9 January 2020
Ethics approval and consent to participate
: The Ethics Committee of the Ruhr-University Bochum approved the study protocol, and informed consent was obtained from the study participants. The committee’s reference number was 16-5587-BR.
: Not applicable.
: The authors declare that they have no competing interests.