1. Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
2. Private Practice, Jeddah, Saudi Arabia
3. Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
4. Private Practice, Cagliari, Italy
5. Department of Orthodontics, School of Dentistry, University of Cagliari, Cagliari, Italy