1. The Institute of Human Genetics, University of Würzburg, Biocentre, Würzburg, Germany
2. Transplantation Biology Group, MRC Clinical Sciences Centre, RPMS, London, U.K.
3. Institut für Experimentelle Hämatologie und Transfusionsmedizin der Universität Bonn, Bonn, Germany
4. Haemostasis Research Group, MRC Clinical Sciences Centre, RPMS, London, U.K.