1. Clinic of Reconstructive Dentistry University of Zurich Zurich Switzerland
2. Center for Dental and Oral Medicine, Department of Periodontology, Operative and Preventive Dentistry University Hospital Bonn Bonn Germany
3. Division of Fixed Prosthodontics and Biomaterials University of Geneva Geneva Switzerland
4. Private Practice Grimm Zahnaerzte Horgen Switzerland
5. Department of Periodontology and Prosthodontics, Eastman Dental Hospital University Policlinic Umberto I Rome Italy
6. Department of Oral Surgery and Implantlogy Carolinum Johan Wolfgang Goethe‐University Frankfurt Frankfurt Germany
7. Private Office Huerzeler/Zuhr Munich Germany
8. Private Practice DIE PRAXIS Berlin Germany
9. Private Practice Le Cannet France
10. ETEP Research Group (Etiology and Therapy of Periodontal and Peri‐implant Diseases) University Complutense Madrid Spain
11. Private Practice Lausanne Switzerland