Received: 8 July 2019
Accepted: 8 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: The institutional review board of Management Center Innsbruck deemed this research exempt of ethics assessment. All participants voluntarily confirmed their willingness to participate in the study by explicitly accepting a written informed consent prior to the survey.
: Not applicable.
: The authors declare that they have no competing interests.