1. Department of General Surgery and Surgical‐Medical Specialties University of Catania Catania Italy
2. Department of Economical, Business and Environmental Sciences and Quantitative Methods University of Messina Messina Italy
3. Department of Biomedical Odontostomatological Sciences and of Morphological and Functional Images University of Messina Messina Italy
4. Department of Periodontology UNC‐Chapel Hill School of Dentistry Chapel Hill NC USA