M Baum1, L Fallowfield2, V Farewell3, F Macbeth4, T Treasure5. 1. University College, Sussex, UK. 2. Sussex Health Outcomes Research & Education in Cancer (SHORE-C), University of Sussex, Sussex, UK. 3. MRC Biostatistics Unit, Cambridge, UK. 4. Centre for Trials Research, Cardiff University, Cardiff, UK. 5. Clinical Operational Research Unit, University College London, London, UK.