Text and Data Mining valid from 2019-06-24
Received: 13 February 2019
Accepted: 17 June 2019
First Online: 24 June 2019
Ethics and consent to participate
: The study was approved by the Ethics Committee of Medical University of Graz (vote#: 30-028 ex 17/18).
: Not applicable
: The authors declare that they have no competing interests.