1. Leibniz-Institute for Arteriosclerosis Research at the University Muenster, Muenster, Germany;
2. Pediatric Neurology, University Children's Hospital Muenster, Muenster, Germany;
3. University Children's Hospital Munich, Munich, Germany; and
4. Thrombosis & Hemostasis Treatment Center, Institute of Clinical Chemistry, University Hospital Schleswig-Holstein, Kiel, Germany