1. Department of Health, Sports & Welfare/Cluster Oral Hygiene Inholland University of Applied Sciences Amsterdam The Netherlands
2. Department of Preventive Dentistry Academic Centre of Dentistry Amsterdam ACTA University University of Amsterdam Amsterdam The Netherlands
3. VU University Medical Centre Amsterdam & Parnassia Psychiatric Institute Parnassia Academy The Hague The Netherlands
4. TNO Research Group Leiden The Netherlands
5. Departement Medical Library Vrije Universtiteit Amsterdam Amsterdam The Netherlands