1. Department of Dermatology Ruhr‐University Bochum Bochum Germany
2. Department of Dermatology Christian Hospital Unna Unna Germany
3. European Center for Angioscience (ECAS) Medical Faculty Mannheim Heidelberg University Mannheim Germany
4. Division of Vascular Oncology and Metastasis German Cancer Research Center Heidelberg (DKFZ‐ZMBH Alliance) Heidelberg Germany