1. Academic Department of Haematology and Cytogenetics, The Royal Marsden Hospital NHS Trust and Institute of Cancer Research, Fulham Road, London, SW3 6JJ, UK
2. Department of Histopathology, The Royal Marsden Hospital NHS Trust and Institute of Cancer Research, Fulham Road, London, SW3 6JJ, UK
3. Department of Statistics, The Royal Marsden Hospital NHS Trust and Institute of Cancer Research, Fulham Road, London, SW3 6JJ, UK