1. Department of Preventive DentistryFaculty of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia
2. Department of Oral and Maxillofacial SurgeryFaculty of Dentistry, Sana'a University, Sana'a, Yemen
3. Department of Maxillofacial Surgery & Diagnostic SciencesFaculty of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia
4. Department of MicrobiologyForsyth Institute, Cambridge, MA, USA