1. Department of Periodontology, Faculty of Dentistry; Ziauddin University; Karachi Pakistan
2. Department of Prosthetic Dental Science, College of Dentistry; King Saud University; Riyadh Saudi Arabia
3. Department of Pharmacology, College of Medicine; King Saud University; Riyadh, Saudi Arabia
4. Department of General Dentistry; Eastman Institute for Oral Health, University of Rochester; Rochester New York