1. Associate Professor, Department of Anatomy, Histology and Legal Medicine, University of Florence, Florence, Italy
2. Assistant Professor, Department of Craniomandibular Disorders, University of Florence, Florence, Italy
3. Assistant Professor, Department of Orthodontics, University of Florence, Florence, Italy; Thomas M. Graber Visiting Scholar, Department of Orthodontics and Pediatric Dentistry, School of Dentistry, The University of Michigan, Ann Arbor, Mich