1. UK NEQAS (Blood Coagulation); Sheffield UK
2. Sheffield Haemophilia and Thrombosis Centre; Royal Hallamshire Hospital; Sheffield UK
3. Angelo Bianchi Bonomi Hemophilia and Thrombosis Center; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico; Milan Italy
4. Department of Pathophysiology and Transplantation; Università degli Studi di Milano and Fondazione Luigi Villa; Milan Italy