1 Division of Vascular Surgery, Department of General Surgery, Medical University of Vienna and University Hospital Vienna, Vienna, Austria.
2 Department of Dermatology, Medical University of Vienna and University Hospital Vienna, Vienna, Austria.
3 Department of Transfusion Medicine and Cell Therapy, Medical University of Vienna and University Hospital Vienna, Vienna, Austria.
4 Division of Vascular Surgery, Department of General Surgery, Medical University of Vienna and University Hospital Vienna, Vienna, Austria. christine.brostjan@meduniwien.ac.at.