Text and Data Mining valid from 2018-11-06
Received: 20 July 2017
Accepted: 11 October 2018
First Online: 6 November 2018
Ethics approval and consent to participate
: According to Dutch Medical Research Involving Human Subject, approval by a medical ethics committee is not obligatory for carrying out this type of research (see: CCMO. Your research: does it fall under the WMO? The Hague, 2015). The return of a completed questionnaire is interpreted as informed consent for participation.
: Not applicable.
: RB and PG declare that they have no competing interests. JJ is an Associate Editor of BMC Health Services Research. During the data collection EC was employed part-time (40%) by health insurer VGZ.
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