1. Department of Prosthodontics; Faculty of Dentistry; Thamar University; Dhamar Yemen
2. Department of Community Medicine, Public Health and Family Medicine; Faculty of Medicine; Jordan University of Science and Technology; Irbid Jordan
3. Department of Oral Diagnosis; College of Dentistry; Al-Qadisiyah University; Al-Diwaniya Iraq
4. Department of Removable Prosthodontics; Faculty of Dentistry; University of Zagreb; Zagreb Croatia
5. Division of Oral Medicine; Department of Maxillofacial Surgery and Diagnostic Sciences; College of Dentistry; Jazan University; Jazan Saudi Arabia
6. Department of Oral Rehabilitation; Faculty of Dentistry; University of San Martín de Porres; Lima Peru
7. Department of Restorative Dentistry; Faculty of Dentistry; University of the Western Cape; Cape Town South Africa
8. Department of Prosthodontics and Crown-Bridge; College of Dental Surgery; BP Koirala Institute of Health Sciences; Dharan Nepal
9. Department of Removable Prosthodontics; Faculty of Dentistry; Saint-Joseph University of Beirut; Beirut Lebanon
10. Department of Restorative Dentistry; School of Dentistry of Ribeirão Preto; University of São Paulo; Sao Paulo Brazil
11. Department of Prosthodontics and Crown-Bridge; A.B. Shetty Memorial Institute of Dental Sciences; Nitte University; Mangalore India
12. Department of Prosthodontics; University College of Medicine and Dentistry; University of Lahore; Punjab Pakistan
13. Private Dental Clinic; Punjab Pakistan
14. Department of Implants and Removable Prosthodontics; Faculty of Dentistry; Pharos University in Alexandria; Alexandria Egypt
15. Department of Basic Sciences; Faculty of Dentistry; University of Khartoum; Khartoum Sudan
16. Department of Prosthodontics; Faculty of Dentistry; Al-Gazira University; Wad Medani Sudan
17. Conservative Department; Faculty of Dentistry; Thamar University; Dhamar Yemen
18. Private Dental Clinic; Dhamar Yemen