1. Research Fellow, Department of Medical, Surgical and Health Sciences, School of Dentistry, University of Trieste, Trieste, Italy.
2. Assistant Professor, Department of Orthodontics and Jaw Orthopaedics, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia.
3. Assistant Professor, Department of Orthodontics, School of Dentistry, University of Florence, Florence, Italy, and Thomas M. Graber Visiting Scholar, Department of Orthodontics and Pediatric Dentistry, School of Dentistry, The University of Michigan, Ann Arbor, Mich.
4. Assistant Professor, Department of Medical, Surgical and Health Sciences, School of Dentistry, University of Trieste, Trieste, Italy.