1. Neuroradiology, Klinikum Grosshadern, Ludwig Maximilian University, 81377 Munich, Germany
2. Transfusion Medicine, Klinikum Grosshadern, Ludwig Maximilian University, 81377 Munich, Germany
3. Departments of Immunology and Transfusion Medicine, University of Luebeck, School of Medicine, 23566 Luebeck, Germany