1. Department of Anaesthesia; Royal Free Hospital; London UK
2. Department of Anaesthesia; Brighton and Sussex University Hospitals; Brighton UK
3. Department of Anaesthesia; University College London Hospital; London UK
4. Department of Anaesthesia; Kings College Hospital; London UK
5. University Department of Surgery; Royal Free Campus; University College London; London UK
6. Katharine Dormandy Haemophilia Centre and Thrombosis Unit; Royal Free Hospital; London UK
7. University of Malta; Tal-Qroqq Msida Malta