1. Department of Orthodontics, Egas Moniz School of Health and Science, Campus Universitário, Quinta da Granja Monte de Caparica, 2829-511 Caparica, Almada, Portugal
2. Egas Moniz Center for Interdisciplinary Research (CiiEM), Egas Moniz School of Health and Science, Campus Universitário, Quinta da Granja, 2829-511 Caparica, Almada, Portugal
3. The Libyan Authority for Scientific Research, Tripoli P.O. Box 80045, Libya
4. Quantitative Methods for Health Research Unit, Egas Moniz School of Health and Science, Campus Universitário, Quinta da Granja, 2829-511 Caparica, Almada, Portugal