| Affiliation: | 1. Department of Dermatology and Allergology, and Center for Venous Disorders of the Departments of Dermatology and Vascular Surgery, Ruhr University Bochum, Bochum, Germany;2. Department of Vascular Medicine, University Hospital Hamburg‐Eppendorf, Hamburg, Germany;3. Department of Vascular Surgery and Phlebology at the Contilia Cardiovascular Center, Elisabeth Hospital Essen, and Division of Vascular Surgery, University Hospital Essen, Essen, Germany;4. Department of Dermatology, University Medicine Greifswald, Greifswald, Germany;5. Division of Angiology, Department of Vascular Medicine, HELIOS Medical Center Krefeld, Krefeld, Germany;6. Department of Vascular Surgery, and Center for Venous Disorders of the Departments of Dermatology and Vascular Surgery, Ruhr University Bochum, Bochum, Germany;7. Department of Dermatology, Inselspital Bern, Bern, Switzerland;8. Department of Dermatology and Allergology, Bonn, Germany, University of Bonn, Bonn, Germany |
