1. The Katharine Dormandy Haemophilia Centre and Thrombosis Unit; Royal Free London NHS Foundation Trust; London UK
2. Centre for Health Research; University of Brighton; Eastbourne UK
3. School of Health Professions; University of Brighton; Eastbourne UK
4. Clinical Epidemiology and Biostatistics Department, and Hamilton-Niagara Hemophilia Program; McMaster University; Hamilton ON Canada
5. Department of Medicine; McMaster University; Hamilton ON Canada