1. Faculty of Odontology; Malmo University; Malmo and Karolinska Institutet; Department of Dental Medicine, Periodontology; Stockholm Sweden
2. Hong Kong
3. Brussels Belgium
4. Ghent Belgium
5. Malmo Sweden
6. Zurich Switzerland
7. Stockholm Sweden
8. Aarhus Denmark
9. Berne Switzerland
10. Giessen Germany
11. Geneva Switzerland
12. Las Palmas Spain
13. Reykjavik Iceland
14. Kristianstad Sweden
15. Gottingen Germany