1. Faculty of Medicine, Department of Dermatology, Venereology and Andrology, Assiut University, Assiut, Egypt;
2. New Assiut University Hospital, Assiut, Egypt;
3. Faculty of Medicine, Department Histology, Sohag University, Sohag, Egypt;
4. Faculty of Medicine, Department of Pathology, Assiut University Hospitals, Assiut, Egypt