1. ETEP Research Group (Etiology and Therapy of Periodontal and Peri‐implant Diseases) Faculty of Odontology, University Complutense of Madrid Madrid Spain
2. Periodontology Unit, Centre for Host Microbiome Interactions Faculty of Dentistry, Oral and Craniofacial Sciences, King's College London London UK
3. Department of Oral and Maxillofacial Diseases University of Helsinki and Helsinki University Hospital Helsinki Finland
4. Department of Oral and Maxillofacial Diseases Kuopio University Hospital Kuopio Finland
5. Center for Clinical and Translational Research The Forsyth Institute Massachusetts Cambridge USA