Kirstin Lund1, Subarna Chakravorty1, Sarmad Toma2, Barbara J Bain1,3. 1. Department of Haematology, St Mary's Hospital, Praed Street, London, W2 1NY, United Kingdom. 2. Department of Molecular Pathology Hammersmith Hospital, Du Cane Road, London, W12 0HS, United Kingdom. 3. Centre for Haematology, Imperial College London, St Mary's Hospital Campus, St Mary's Hospital, Praed Street, London, W2 1NY, United Kingdom.