1. Oral Medicine and Periodontology Department Faculty of Dentistry Cairo University Cairo Egypt
2. Department of Surgery and Oral Medicine National Research Centre Cairo Egypt
3. Department of Medical Biochemistry Molecular Biology and Tissue Engineering Unit Cairo University School of Medicine Cairo Egypt
4. Medical Biochemistry and Molecular Biology, Faculty of Medicine Badr University Cairo Egypt
5. Stem Cell and Tissue Engineering Unit Faculty of Dentistry Cairo University Cairo Egypt
6. Clinic for Conservative Dentistry and Periodontology School of Dental Medicine Christian‐Albrecht's University Kiel Germany