1. Department of Haematology; Imperial College Healthcare NHS Trust, Hammersmith Hospital; Ducane Road London W12 0HS
2. Department of Haematology; University Hospitals of Leicester NHS Trust, Infirmary Square; Leicester LE1 5WW
3. Wessex Regional Genetics Laboratory; Salisbury District Hospital; Salisbury SP2 8BJ
4. St Mary's Hospital Campus of Imperial College; St Mary's Hospital; Praed Street London W2 1NY