1. Department of Dermatology, Faculty of Medicine, Cairo University, Cairo, Egypt
2. Kasr AL-Ainy Psoriasis Unit (KAPU), Dermatology Department, Faculty of Medicine, Cairo University, Cairo, Egypt
3. Department of Dermatology and Venereology, National Research Centre, Giza, Egypt
4. Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Cairo University, Cairo, Egypt
5. Department of Epidemiology and Biostatistics, National Cancer Institute, Cairo University, Cairo, Egypt