1. Professor, Department for Dermatology, Venerology and Allergology, University School of Medicine, Essen, Germany
2. Professor, Clinic Director, Department for Vascular Medicine, HELIOS Clinic, Krefeld, Germany
3. Professor Clinic Director, Department for Vascular and Thoracic Surgery, Municipal Hospital Karlsruhe, Academic Teaching Hospital Univ. Freiburg, Germany
4. Clinic-Center North, Center for Diabetes, Dortmund, Germany
5. EngelsConsult, Bergisch Gladbach, Germany