Received: 6 April 2018
Accepted: 29 May 2019
First Online: 14 June 2019
Ethics approval and consent to participate
: For the first two included studies, ethical approval was provided by the Amsterdam School of Communication Research (number 2013-CW-5) [CitationRef removed,CitationRef removed]. For the third included study, the Medical Ethics Review Committee of the Amsterdam Medical Center waived the study from requiring official approval in terms of the Medical Research Involving Subjects Act (WMO) [CitationRef removed]. For the fourth included study, the Medical Ethics Committee of the University of Amsterdam approved the study protocol. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare they have no competing interests.