1. Department of Dermatology; Venereology and Allergology; Essen University Medical Center; Essen Germany
2. “The Skin Experts” - Dermatology; Venereology; Allergology; and Phlebology Practice; Berlin Germany
3. Drs. Kurzhals - Dermatology; Venereology; and Phlebology Practice; Wangen/Allgäu Germany
4. Dr. Noori - Dermatology and Venereology Practice; Vienna Austria
5. Department of Dermatology; Venereology and Allergology; Center for Venous Diseases of the Departments of Dermatology and Vascular Surgery; Ruhr University; Bochum Germany
6. Dr. Schlaeger - Dermatology; Venereology; and Allergology Practice; Oldenburg Germany
7. Former Department of Dermatology; Allergology; Phlebology; and Lymphology; Sanaderm Hospital; Bad Mergentheim Germany
8. Working Group Evidence-based Medicine Frankfurt; Institute of General Medicine; Johann Wolfgang Goethe University; Frankfurt Germany
9. Department of Dermatology; Venereology and Allergology; University Medical Center of the Johann Wolfgang Goethe University; Frankfurt Germany
10. Dr. Jungkunz; Dermatology; Venereology; Phlebology; Allergology; and Proctology Practice; Friedberg/Hessen Germany