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Contributors RW conducted the statistical analyses and drafted the manuscript. MW, GN and HdV contributed to the design of the study. All authors revised the manuscript critically for important intellectual content and read and approved the final manuscript.
Funding This work was supported by ZonMw grant number 50-51300-98-010.
Competing interests None.
Ethics approval The Central Committee on Research Involving Human Subjects in the Netherlands requires no ethical approval for non-medical survey research.
Ethics approval ZonMw.
Provenance and peer review Not commissioned; externally peer reviewed.