1. PhD Student, Department of Orthodontics, University of Rome Tor Vergata, Rome, Italy.
2. Postgraduate Student, Department of Orthodontics, University of Rome Tor Vergata, Rome, Italy.
3. Statistician, Edinburgh Clinical Trials Unit (ECTU), University of Edinburgh, Edinburgh, United Kingdom.
4. Professor and Department Chair, Department of Orthodontics, University of Rome Tor Vergata, Rome, Italy.