1. Goethe University Frankfurt University Hospital Department of Dermatology, Venerology and Allergology Frankfurt am Main Germany
2. Vascular Center Department of Angiology Northwest Hospital Frankfurt am Main Germany
3. Competence Center for Health Services Research in Dermatology Institute for Health Services Research in Dermatology and Nursing University Medical Center Hamburg‐Eppendorf Hamburg Germany
4. Department of Dermatology University Medical Center Erlangen Friedrich‐Alexander University of Erlangen‐Nürnberg Erlangen Germany
5. APV‐Zertifizierungs GmbH Kassel Germany
6. Initiative Chronische Wunden Quedlinburg Germany
7. Department of Dermatology Venereology and Allergology University Hospital Schleswig‐Holstein, Campus Lübeck Lübeck Germany
8. Professional Association of Phlebologists and Lymphologists Freiburg Germany
9. Hospital Marktoberdorf Department of Surgery Kreiskliniken Ostallgäu Marktoberdorf Germany
10. Welfare Center Leonberg Gerlingen Germany
11. Hospital Brixen Internal Medicine Brixen Italy
12. Dermatology Office Prof. Dr. Markus Meissner Wiesbaden Germany
13. Department of Angiology University Hospital Leipzig Leipzig Germany
14. St. Marien Hospital Herne Department of Vascular Surgery Ruhr University Bochum Herne Germany
15. Private Office Dermatology & Phlebology Bonn Germany
16. Department of Vascular Surgery Diakonie‐Klinikum Schwäbisch Hall Germany
17. Goethe University Frankfurt, University Hospital Department of Endovascular and Vascular Surgery Frankfurt am Main Germany
18. University Department of Dermatology Eberhard Karls University Tübingen Germany
19. Institute for General Practice Medical Faculty Heinrich Heine University Düsseldorf Düsseldorf Germany
20. Department of Dermatology Venereology and Allergology Catholic Hospital Bochum St. Josef Hospital University Medical Center Ruhr University Bochum Bochum Germany
21. Department of Dermatology Venereology and Allergology University Medical Center Essen Essen Germany