1. From the Molecular and Population Genetics Laboratory, London Institute, Cancer Research UK; Department of Clinical Genetics, Guy's Hospital; Family Cancer Clinic, Colorectal Cancer Unit, Cancer Research UK, and Academic Department of Histopathology, St Mark's Hospital; Cancer Research UK, Department of Epidemiology, Mathematics and Statistics, Wolfson Institute of Preventive Medicine, St Bartholomew's, and the London Medical School, London; Department of Clinical Genetics, St George's Hospital Medical...