1. Dental Practitioner, Private Practice, Ibb, Yemen
2. Department of Preventive Dental Sciences, Faculty of Dentistry, Najran University, Najran, Saudi Arabia
3. Department of Periodontics and Community Dental Science, College of Dentistry, King Khalid University, Abha, Saudi Arabia
4. Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
5. Department of Orthodontics, College of Dentistry, Thamar University, Thamar, Yemen
6. Prosthetic Department, College of Dentistry, King Khalid University, Abha, Saudi Arabia
7. Department of Restorative and Implant Dentistry, Armed Forces Hospital South Region, Aseer, Saudi Arabia
8. Department of Prosthodontics, Faculty of Dentistry, Taif University, Taif, Saudi Arabia