Text and Data Mining valid from 2020-03-06
Received: 28 January 2020
Accepted: 2 March 2020
First Online: 6 March 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Medical University of Vienna (#1291). All participants provided written informed consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.