1. Division of Angiology, University Center of Vascular Medicine, University Hospital Regensburg, Regensburg, Germany
2. Gerinnungszentrum Rhein-Ruhr, Duisburg, Germany
3. Centrum für Blutgerinnungsstörungen und Transfusionsmedizin, Düsseldorf, Germany
4. Department of Haematology and Oncology, Internal Medicine III, University Hospital Regensburg, Regensburg, Germany