1. Department of Dental Clinical Specialties, School of Dentistry, Complutense University, Madrid, Spain
2. Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
3. Department of Oral and Maxillofacial Surgery, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark
4. Department of Health Sciences, University of Catanzaro “Magna Graecia”, Catanzaro, Italy
5. Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Bern, Switzerland
6. Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
7. Conservative Dentistry and Orofacial Prosthodontics, School of Dentistry, Complutense University, Madrid, Spain