1. Unilever Research and Development; Vlaardingen The Netherlands
2. Unit of Periodontology; University Medicine; Ernst-Moritz-Arndt University Greifswald; Greifswald Germany
3. Unilever Research and Development; Bebington UK
4. Institute for Community Medicine; University Medicine; Ernst-Moritz-Arndt-University Greifswald; Greifswald Germany
5. Institute of Clinical Chemistry and Laboratory Medicine; University Medicine; Ernst-Moritz-Arndt-University Greifswald; Greifswald Germany
6. Department of Oral Surgery; School of Dentistry; University of Birmingham; Birmingham UK