Text and Data Mining valid from 2020-04-15
Received: 22 February 2019
Accepted: 26 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: The ethical committee of Upper Austria stated no objection against execution of this study. The committee’s reference number is 1094/2018.
: Not applicable.
: The authors declare that they have no competing interests.