1. Cambridge Haemophilia and Thrombophilia Centre; Addenbrookes Hospital; Cambridge University Hospitals NHS Trust; Cambridge UK
2. Department of Clinical Chemistry, University Hospital; University and Regional Laboratories Region Skane; Malmo Sweden
3. Angelo Bianchi Bonomi Hemophilia and Thrombosis Center; Department of Clinical Sciences and Community Health; Università degli Studi di Milano and IRCCS Cà Granda Maggiore Hospital Foundation; Milano Italy
4. Service Hematologie Biologie; Hopital Tenon; Paris France
5. Department of Vascular Medicine; Academic Medical Center; Amsterdam Netherlands
6. Department of Clinical and Experimental Medicine; University of Insubria; Varese Italy