1. British Heart Foundation Glasgow Cardiovascular Research Centre, Division of Cardiovascular and Medical Sciences, University of Glasgow, 126 University Place, Glasgow G12 8TA, United Kingdom
2. Haemostasis and Thrombosis, MRC Clinical Sciences Centre, Imperial College London, Du Cane Road, London W12 0NN, United Kingdom
3. Department of Haematology, Haemophilia Centre and Haemostasis Unit, Royal Free and University College Medical School, London NW3 2PF, United Kingdom
4. Crucell, P.O. Box 2048, 2301 CA Leiden, The Netherlands