Funding for this research was provided by:
zonmw (515500002, 170996006)
Received: 30 August 2017
Accepted: 27 September 2018
First Online: 20 October 2018
Ethics approval and consent to participate
: The study protocol has been presented to the Medical Ethical Committee of the Radboud university medical center (registration number: 2011/332). They declared that ethical approval was not required under Dutch National Law. Participants received information about the purpose of the study and that anonymous and confidential handling of data was ensured, and that informed consent was given by completing and sending in the questionnaire.
: Not applicable.
: The authors declare that they have no competing interests. The funding bodies had no involvement in the design and conduct of the study, nor in the writing and submission of this manuscript.
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