Text and Data Mining valid from 2020-03-24
Received: 17 July 2019
Accepted: 27 February 2020
First Online: 24 March 2020
Ethics approval and consent to participate
: The ethics commission for the state of Salzburg/ Austria approved this research project with the official notice labelled 415-E/2158/4–2017. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.