1. Department of Haematology, Haemophilia and Thrombophilia Centre, Box 217; Addenbrooke's Hospital; Cambridge UK
2. Department of Anaesthesia and Intensive Care; Assistance publique-Hôpitaux de Paris; Cochin University Hospital; Université Paris Descartes; Paris France
3. Institut für Immunologie und Transfusionsmedizin; Greifswald Germany
4. Thrombosis and Haemophilia Centre; Guy's & St Thomas' Hospital NHS Foundation Trust; London UK