1. Research Unit in Periodontology and Periodontal Medicine Department of Experimental and Clinical Medicine University of Florence Florence Italy
2. Department of Periodontics & Oral Medicine University of Michigan School of Dentistry Ann Arbor MI USA
3. Department of Biomedical Surgical and Dental Sciences Foundation IRCCS Ca' Granda Policlinic University of Milan Milan Italy
4. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine University of Pisa Pisa Italy
5. European Research Group on Periodontology (ERGOPERIO) Genova Italy
6. Division of Periodontology Faculty of Dentistry Hong Kong University Hong Kong China
7. Department of Oral and Maxillo‐Facial Implantology Shanghai Key Laboratory of Stomatology National Clinical Research Centre for Stomatology Shanghai Ninth People Hospital School of Medicine Shanghai Jiao Tong University Shanghai China