Funding for this research was provided by:
Horizon 2020 (733381)
Received: 2 August 2019
Accepted: 20 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: Informed consent for using the contact details of the participants was sought and provided. This study is part of the ESCAPE-NET study which has been approved by the Institutional Review Board of Amsterdam UMC.
: Not applicable.
: The authors declare that they have no competing interests.