¹Assistant Professor of Oral and Maxillofacial Surgery, Faculty of Dentistry, Future University, ²Assistant Professor of Periodontology, Oral Medicine and Oral Diagnosis, Faculty of Dentistry, Misr University for Science and Technology,³Assistant Professor of General Histology, Faculty of Dentistry, Future University, ⁴Assistant Professor of Medical Biochemistry, Faculty of Medicine, Cairo University, Cairo, Egypt

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