1. Department of Internal Medicine Division of Hemostaseology Goethe University Hospital Frankfurt Frankfurt am Main Germany
2. Division of Vascular Medicine Swiss Cardiovascular Center Inselspital Bern University Hospital Bern Switzerland
3. Institute for Transfusion Medicine Dessau Red Cross Blood Transfusion Service NSTOB Dessau Germany
4. Department of Dermatology Goethe University Hospital Frankfurt Frankfurt am Main Germany
5. Division of Dermatology and Venereology Geneva University Hospitals Geneva Switzerland
6. Department of Pathology and Immunology University of Geneva Geneva Switzerland
7. Agaplesion Bethanien Hospital Cardiovascular Centre Bethanien (CCB) Frankfurt am Main Germany
8. Department of Dermatology and Lübeck Institute of Experimental Dermatology University of Lübeck Lübeck Germany