1. ETEP (Etiology and Therapy of Periodontal and Peri‐Implant Diseases) Research Group University Complutense 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 Periodontology Universitat Internacional de Catalunya Barcelona Spain
5. Department of Periodontics and Oral Medicine University of Michigan Ann Arbor Michigan USA
6. Division of Maxillofacial Surgery University of Torino Torino Italy