1. Department of Haematology; Aberdeen Royal Infirmary; Aberdeen UK
2. Oxford Haemophilia & Thrombosis Centre; Churchill Hospital; Oxford UK
3. Centre for Haematology; Imperial College; Hammersmith Hospital; London UK
4. Department of Haematology; Glasgow Royal Infirmary; Glasgow UK
5. Sheffield Haemophilia and Thrombosis Centre; University of Sheffield; Sheffield UK
6. Department of Cardiovascular Science; University of Sheffield; Sheffield UK