1. Department of Orthodontics, Vita Salute San Raffaele University, Milan, Italy
2. Unit of Dentistry, Division of Orthodontics, Research area in Dentofacial Orthopedics and Orthodontics, IRCCS San Raffaele Scientific Institute, Milan, Italy
3. Department of Orthodontics, Faculty of Odontology, Malmő University, Malmő, Sweden