1. Interdisciplinary Vein Center; HELIOS Klinikum Wuppertal; Germany
2. Department of Dermatology; Universität Witten/Herdecke; HELIOS Klinikum Wuppertal; Germany
3. Department of Vascular Surgery; Universität Witten/Herdecke; HELIOS Klinikum Wuppertal; Germany