1. Department of Dermatology and Venerology, Faculty of Medicine, Cairo University, Cairo, Egypt
2. Department of Public Health and Community Medicine, Faculty of Medicine, Fayoum University, Fayoum, Egypt
3. Department of Dermatology, Fayoum University Hospital, Fayoum, Egypt
4. Department of Dermatology and Venerology, Faculty of Medicine, Fayoum University, Fayoum, Egypt