1. Department of Periodontology, Università degli Studi di Torino, Turin, Italy
2. Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, Milan, Italy
3. IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
4. Department of Oral Surgery, Institute of Dentistry, I. M. Sechenov First Moscow State Medical University, Moscow, Russia