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Article History

Received: 4 August 2017

Accepted: 12 February 2018

First Online: 20 February 2018

Ethics approval and consent to participate

: The medical ethics committee of the VU medical center approved the protocol in 2014 (registration number 2014.364). Written informed consent was obtained from all study participants.

: Not applicable.

: EM has no conflicts of interest. JH received grants from NWO, ZonMw and Samsung, during the conduct of the study and received a fee from Olympus, outside the submitted work. JA holds a chair in Insurance Medicine paid by the Dutch Social Security Agency, he is stockholder of Evalua and received grants from ZonMw/NWO, Instituut Gak, UWV, SZW, VWS, Pfizer, Achmea, CVZ/Zorg Instituut outside the submitted work. CT is vice-president of the PROMIS Health Organization and coordinator of the Dutch-Flemish PROMIS group.

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