1. AstraZeneca, Global Medicines Development; Biometrics and Information Sciences; Mereside, Alderley Park Macclesfield SK10 4TG U.K.
2. Roche Pharmaceuticals; 6 Falcon Way Welwyn Garden City AL7 1TW U.K.
3. MRC Biostatistics Unit Hub for Trials Methodology Research, Cambridge Institute of Public Health; Cambridge Biomedical Campus; Forvie Site, Robinson Way Cambridge CB2 0SR U.K.