Funding for this research was provided by:
Horizon 2020 Framework Programme (633595)
Received: 11 April 2019
Accepted: 2 July 2019
First Online: 23 July 2019
Ethics approval and consent to participate
: The study was conducted following the principles of the Declaration of Helsinki, approved by the medical ethics committee of the University Medical Centre Groningen (METc code: 2008/284) and all participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.