1. Centre for Observational Research & Data Sciences, Bristol-Myers Squibb, Uxbridge UB8 1DH, UK
2. Medical Department, Bristol-Myers Squibb, 1366 Lysaker, Norway
3. Medical Department, Bristol-Myers Squibb, Uxbridge UB8 1DH, UK
4. Haemophilia & Thrombosis Centre, University Hospital Wales, Cardiff, UK