Funding for this research was provided by:
ZonMw (project number 171002203)
Stichting Achmea (n.a.)
Received: 19 November 2019
Accepted: 10 June 2020
First Online: 18 June 2020
Ethics approval and consent to participate
: The study was reviewed and approved by the medical ethical committee of the Leiden University Medical Centre, the Netherlands. All general practitioners and participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.