Francesca Cervinara, Stefania Sirignano, Giorgio Alfredo Spedicato, Giuseppe Siciliani, Luca Lombardo Francesca Cervinara 1, Stefania Sirignano 2, Giorgio Alfredo Spedicato 3, Giuseppe Siciliani 4, Luca Lombardo 5 - 1. Student, School of Orthodontics University of Ferrara, Italy; 2. Graduate in dentistry , University di Ferrara, Italy; 3. Professor in Statistics, Economics and Actuarial Science, University of Bologna, Italy; 4. Professor and Chairman dental school Ferrara University, Italy; 5. Professor and Chairman of the Postgraduate School of Orthodontics, University of Ferrara, Italy
