DRK Blutspendedienst Baden-Wurttemberg – Hessen gGmbH, Frankfurt, Germany; Department of Thoracic and Cardiovascular Surgery, J. W. Goethe University, Frankfurt, Germany; Department of Haemostaseology and Transfusion Medicine, Bad Nauheim, Germany; German Red Cross Blood Donor Service Baden-Wuerttemberg- Hessen, Frankfurt, Germany; University Clinic Munich, Department for Transfusion Medicine, Munich, Germany; Cerus Corporation, Concord, United States of America