1. Department of Dermatology; University of Luebeck; Luebeck Germany
2. Department of Dermatology; Cairo University; Cairo Egypt
3. Clinical Immunology Unit (Clinical Pathology Department); Mansoura University; Mansoura Egypt
4. Department of Dermatology; Mansoura University; Mansoura Egypt
5. Department of Dermatology; University of Marburg; Marburg Germany