1. Department of Public Health and Community Medicine, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
2. Department of Public Health and Community Medicine, Damietta Faculty of Medicine, Al-Azhar University, Damietta, Egypt
3. Department of Infectious and Endemic Diseases, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
4. Department of Dermatology, Sherbein Central Hospital, Sherbein City, El-Dakhalia, Egypt