1. Mansoura Dermatology, Venerology and Leprology Hospital Mansoura Egypt
2. Department of Dermatology University of Rome G. Marconi Rome Italy
3. Department of Dermatology University Medical Center Mainz Mainz Germany
4. Department of Dermatology University Hospital Basel Basel Switzerland
5. Division of Gastroenterology Dicle University Faculty of Medicine Diyarbakir Turkey