1. Department of Biomedical, Surgical and Dental Sciences; University of Milan; Milan Italy
2. Foundation IRCCS Ca’ Granda Polyclinic; Milan Italy
3. European Research Group on Periodontology (ERGOPerio); Berne Switzerland
4. Faculty of Dentistry; Department of Periodontology; University of Hong Kong; Sai Ying Pun Hong Kong
5. Accademia Toscana di Ricerca Odontostomatologica (ATRO); Firenze Italy