1. Department of Dermatology, Kuwait University Hospital , Sana'a , Yemen
2. Mansoura Dermatology, Venerology and Leprology Hospital , Mansoura , Egypt
3. Department of Dermatology, University of Studies Guglielmo Marconi , Rome , Italy
4. Department of Dermatology and Allergology, Städtisches Klinikum Dresden, Academic Teaching Hospital , Dresden , Germany
5. Department of Pathology, Faculty of Medicine, Al-Azhar University , Cairo , Egypt