Francesca Gaffuri1, Gianguido Cossellu2, Valentina Lanteri2, Elisabetta Brotto3, Marco Farronato2. 1. Department of Biomedical, Surgical, and Dental Sciences, School of Dentistry, University of Milan, Milan, Italy. francescagaffuri93@gmail.com. 2. Department of Biomedical, Surgical, and Dental Sciences, School of Dentistry, University of Milan, Milan, Italy. 3. Private practice of orthodontics, Milan, Italy.