Funding for this research was provided by:
H2020 Marie Skłodowska-Curie Actions (676408)
Received: 7 August 2019
Accepted: 9 January 2020
First Online: 17 January 2020
Ethics approval and consent to participate
: This study was approved by the Central Committee on Research Involving Human Subjects in the region Arnhem-Nijmegen (2002/188) and all participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.