1. Department of Oral Surgery; Heinrich Heine University; Düsseldorf Germany
2. Department of Periodontology; Lisbon Dental School; University of Lisbon; Lisbon Portugal
3. Department of Oral and Maxillofacial Surgery; Albert-Ludwigs University Freiburg; Freiburg Germany
4. Camlog Foundation; Basel Switzerland
5. Department of Reconstructive Sciences; University of Connecticut School of Dental Medicine; Farmington CT USA
6. Department of Prosthodontics; Munich Dental School; Munich Germany
7. Charité Centre 3 for Dental, Oral and Maxillary Medicine; Department of Oral Medicine; Dental Radiology and Oral Surgery Charité - Medical University of Berlin / Charité; Berlin Germany