1 King's Thrombosis Centre, Department of Haematological Medicine, King's College Hospital National Health Service Foundation Trust, London SE5 9RS, UK. Electronic address: lara.roberts@nhs.net.
2 Department of Clinical and Experimental Medicine, University of Surrey, Guildford, UK.
3 King's Thrombosis Centre, Department of Haematological Medicine, King's College Hospital National Health Service Foundation Trust, London SE5 9RS, UK.