Document is current

Article History

Received: 20 March 2018

Accepted: 22 January 2019

First Online: 13 February 2019

Ethics approval and consent to participate

: The ethics approval for this project was provided by the University of Zurich, as per the school’s guidelines (swissethics number: Req-2017-00468). In line with ethical guidelines, all participants volunteered to participate, signed a written consent for study participation and were allowed to end the experiment at any time. All participants were older than 18 years old and were compensated with CHF 20.-.

: The photographer (Fig. b) and individuals portrayed provided consent for the image to be used in this publication.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.