Funding for this research was provided by:
European Commission (621000)
Received: 9 August 2019
Accepted: 27 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: Ethical and scientific approval was granted by the Scientific and Ethical Review Board of the Faculty of Behavioural and Movement Sciences at the VU Amsterdam (file number: VCWE-2016-006) and by local medical ethical committees and relating regulatory agencies of the participating countries. All participating professionals received an written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.