Received: 20 October 2017
Accepted: 27 November 2018
First Online: 5 December 2018
Ethics approval and consent to participate
: The medical ethics committee of the University Medical Centre Utrecht approved the study protocol, followed by the Institutional Scientific Boards of the following Dutch participating centres:UnorderedList removed
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.