1. Angelo Bianchi Bonomi Hemophilia and Thrombosis Center; Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico; Luigi Villa Foundation; Milan Italy
2. Department of Pathophysiology and Transplantation; Università degli Studi di Milano; Milan Italy
3. Sheffield Haemophilia and Thrombosis Centre; Royal Hallamshire Hospital; Sheffield UK
4. Arthur Bloom Haemophilia Centre; School of Medicine; Cardiff University; Cardiff UK
5. Department of Pathology and Molecular Medicine; Queen's University; Kingston Canada
6. Pediatrics and Pathology; University of Michigan; Ann Arbor MI USA
7. Department of Health Research Methods, Evidence, and Impact; and Department of Medicine; McMaster University; Hamilton Canada
8. Department of Clinical Epidemiology; Leiden University Medical Center; Leiden the Netherlands