1. Department of Periodontology; School of Dental Medicine; University of Bern; Bern Switzerland
2. Private Practice; Koppigen Switzerland
3. Institute for Social and Preventive Medicine; University of Bern; Bern Switzerland
4. Private Practice; Zürich Switzerland
5. University of Iceland; Reykjavik Iceland
6. Division of Fixed Prosthodontics; School of Dental Medicine; University of Bern; Bern Switzerland
7. Professor Emeritus; School of Dental Medicine; University of Bern; Bern Switzerland