1. Department of Dermatology, Venereology and Andrology, Faculty of Medicine, Tanta University, Tanta, Egypt
2. Department of Pediatric Medicine, Faculty of Medicine, Tanta University, Tanta, Egypt
3. Department of Dermatology, Etay El-Barud Hospital, El Beheira, Egypt
4. Department of Dermatology Venereology and Andrology, Member of Pediatric Dermatology Unit, Faculty of Medicine, Tanta University, Tanta, Egypt