Funding for this research was provided by:
ZonMw, the Netherlands Organisation for Research and Development (80-80705-98-032)
NWO, the Netherlands Organisation for Scientific Research (023.010.044)
Received: 9 May 2019
Accepted: 26 July 2019
First Online: 5 August 2019
: The Ethical Review Board of the Open University of The Netherlands approved the study (reference U2014/07279/HVM). The board concluded that the study is in line with the ethical codes for research in Human Subjects. Verbal informed consent was obtained from all participants, which was approved by the ethics committee because the study did not refer to a delicate or privacy-sensitive subject.
: Not applicable.
: The authors declare that they have no competing interests.