1. Dean of Postgraduate Faculty, Sinai University, El Arish Branch, El Arish, Egypt.
2. Department of Oral Medicine and Periodontology, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt.
3. Community Service and Environmental Development, Faculty of Dentistry, Nahda University, Beni Suef, Egypt.
4. Department of Oral Medicine, Periodontology and Oral Diagnosis Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
5. Department of Preventive Dental Sciences, College of Dentistry, Taibah University, Almadinah Almunawwarah, Saudi Arabia.
6. Department of Oral & Maxillofacial Diagnostic Sciences, College of Dentistry, Taibah University, Almadinah Almunawwarah, Saudi Arabia.
7. Department of Clinical Pharmacy, Al-Munirah General Hospital, Ministry of Health, Cairo, Egypt.