1. King's Thrombosis Centre, Department of Haematological Medicine, London, UK
2. Royal Infirmary of Edinburgh, NHS Lothian, Edinburgh, UK
3. Wolfson Institute for Population Health, Queen Mary's University London, London, UK
4. Thrombosis & Haemophilia Centre, Guy's and St Thomas Hospital NHS Foundation Trust, London, UK
5. Department of Haematology, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, UK
6. Department of Haematology, University Hospital Birmingham NHS Foundation Trust, Birmingham, UK
7. Leicester Haemostasis and Thrombosis Centre, University Hospitals of Leicester NHS Trust, Leicester, UK
8. Department of Haematology, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
9. Department of Haematology, University College Hospitals NHS Foundation Trust, London, UK
10. Department of Obstetric and Maternal and Fetal Medicine, Manchester University NHS Foundation Trust, Manchester, UK
11. Department of Haematology, Nottingham University NHS Trust, Nottingham, UK