1. Unit of Orthodontics, Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy.
2. Department of Orthodontics, University of Brescia, Brescia, Italy.
3. Department of Neuroscience, Reproductive Science and Oral Science, University of Naples "Federico II", Naples, Italy.
4. Department of Pediatric Surgery, Bambino Gesù Children's Hospital, Rome, Italy.