Niecke, A.
Hartog, C.
Deffner, T.
Janssens, U.
Michels, G.
Article History
Received: 27 July 2018
Revised: 15 October 2018
Accepted: 22 November 2018
First Online: 3 January 2019
Compliance with ethical guidelines
:
: A. Niecke, C. Hartog, T. Deffner, U. Janssens and G. Michels declare that they have no competing interests.
: The authors did not conduct any studies with human or animal participants for this article. Informed consent was obtained from all participants included in the survey.