1. Department of Conservative Dentistry, Faculty of Dentistry University of Chile Santiago Chile
2. Center for Surveillance and Epidemiology of Oral Diseases, Faculty of Dentistry University of Chile Santiago Chile
3. Clinic of Reconstructive Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
4. Department of Oral Biology, University Clinic of Dentistry Medical University of Vienna Vienna Austria
5. ETEP (Etiology and Therapy of Periodontal and Peri‐Implant Diseases) Research Group University Complutense of Madrid Madrid Spain