1. Department of Prosthetic Dental Sciences; College of Dentistry, King Saud University; Riyadh Saudi Arabia
2. Department of Periodontology, Faculty of Dentistry; Ziauddin University; Karachi Pakistan
3. Department of Oral Medicine and WHO Collaborating Centre for Oral Cancer; Kings College London; London United Kingdom
4. Department of General Dentistry; Eastman Institute for Oral Health, University of Rochester; Rochester New York