Received: 7 May 2019
Accepted: 11 October 2019
First Online: 29 October 2019
Ethics approval and consent to participate
: The study did not require ethics approval according to national legislation because the research is not defined as health research according to the Health Research Act §4 (english version: ExternalRef removed<b>)</b>.The participants consented to participate in the research on the first survey page by chosing between the options “I consent” and “I do not consent”.
: Not applicable.
: The authors declare that they have no competing interests.