Funding for this research was provided by:
Ministerie van Volksgezondheid, Welzijn en Sport
Text and Data Mining valid from 2020-01-03
Received: 8 July 2019
Accepted: 20 December 2019
First Online: 3 January 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The Medical Ethics Committee of the LUMC was consulted in order to verify whether ethical approval was necessary. Since the survey was initiated by the NFK in such a manner that the respondents could not be identified and participation was anonymous and fully voluntarily, the Committee declared that no formal ethical approval was needed (protocol number G19.052).
: Herewith I state to have full control of all primary data and I agree to allow the journal to review our data if requested.