1 Cancer Epidemiology and Prevention Research Unit, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, UK.
2 Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina, Greece.
3 Cancer Epidemiology Unit, Oxford Population Health, University of Oxford, Oxford, UK.
4 MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK.