1. Central Facility, ECAA, Department of Pathological Sciences, University of Manchester, U.K.,
2. Haemostasis and Thrombosis Research Centre, Leiden University Medical Centre, The Netherlands,
3. Department of Clinical Biochemistry, Centralsygehuset, Esbjerg, Denmark,
4. A Bianchi Bonomi, Haemophilia and Thrombosis Centre, University and IRCCS Maggiore Hospital, Milan, Italy