1. ETEP (Etiology and Therapy of Periodontal Diseases) Research Group, Department of Dental Clinical Specialties; University Complutense; Madrid Spain
2. Department of Dental Medicine; Karolinska Institutet; Huddinge Sweden
3. Private clinic; Lisboa Portugal
4. Center of Dental Medicine, Clinic of Fixed and Removable Prosthodontics and Dental Material Science; University of Zurich; Zurich Switzerland
5. Department of Periodontology and Oral Implantology, Educational Committee Dental School; Ghent University; Ghent Belgium
6. Research Cluster Periodontology, Oral Implantology, Removable & Implant Prosthodontics; Ghent University; Ghent Belgium
7. Department of Periodontology, Institute of Odontology; The Sahlgrenska Academy at University of Gothenburg; Gothenburg Sweden
8. Charité Universitätsmedizin Berlin; Charité Berlin School of Public Health; Berlin Germany
9. International Research Collaborative; The University of Western Australia; Perth WA Australia
10. Cosmodent Center for Dentistry and Dental Implants; Istanbul Turkey
11. Clinica Salgado; Alicante Spain
12. Group Aula Dental Avanzada, Departamento de Anatomía e Histología, Universidad Miguel Hernández; Alicante Spain