1. Institute of Experimental Haematology and Transfusion Medicine; University Clinic Bonn; Bonn Germany
2. Division of Angiology and Haemostasis; University Hospital and Faculty of Medicine; Geneva Switzerland
3. Department of Pediatrics and Adolescent Medicine; University of Freiburg; Freiburg Germany
4. Department of Pediatric Haematology and Oncology; Dr. von Hauner Children's Hospital; Ludwig-Maximilians-University Munich; Munich Germany
5. Medical Laboratory Bremen; Bremen Germany