1. Private Practice; Rome Italy
2. Department of Dentistry; University “Tor Vergata”; Rome Italy
3. Department of Periodontology; Tuscany Dental School; University of Siena-Florence; Siena Italy
4. Department of Periodontology; Catholic University Sacred Heart; Rome Italy
5. Hygiene Unit; Department of Public Health and Infectious Diseases; Pharmacy and Medicine Faculty; Sapienza University of Rome; Rome Italy