Received: 6 October 2017
Accepted: 1 February 2018
First Online: 9 February 2018
Ethics approval and consent to participate
: Ethical approval was obtained from the Ethics Committee of the Department of Psychology of the Philipps University of Marburg, Germany (no. 2015-32 k). Written informed consent was obtained before starting the survey from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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