Text and Data Mining valid from 2020-02-03
Received: 14 August 2019
Accepted: 29 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: The authors declare that no approval by an institutional review board (ethics commission) was required for this study.
: A consent for publication was not necessary. All participating institutions of this survey were informed about the planned publication of the results with the cover letter to the questionnaire.
: The authors declare that they have no competing interests.