About the Authors

Inge Grootjans-van Kampen

Affiliation Education and Student Affairs, Technical University, Delft, The Netherlands

Peter M. Engelfriet

Affiliation Centre for Prevention and Health Services Research, Institute for Public Health and the Environment, Bilthoven, The Netherlands

Pieter H. M. van Baal

vanbaal@bmg.eur.nl

Affiliation Institute of Health Policy and Management, Erasmus University, Rotterdam, The Netherlands

Competing Interests

Pieter van Baal is an AE for PLOS One. This does not alter the authors' adherence to PLOS ONE Editorial policies and criteria.

Author Contributions

Conceived and designed the experiments: PvB. Performed the experiments: IG. Analyzed the data: IG. Wrote the paper: IG PvB PE.