Text and Data Mining valid from 2019-11-11
Received: 22 July 2019
Accepted: 2 October 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: The present work is approved by the Ethics Commission of the Technical University of Munich (TUM) and is registered with the project number 320/14.
: Not applicable.
: The authors declare that they have no competing interests.