1. Department of Hygiene and Epidemiology University of Ioannina School of Medicine Ioannina Greece
2. Section of Nutrition and Metabolism International Agency for Research on Cancer Lyon France
3. Department of Epidemiology and Biostatistics School of Public Health, Imperial College London London UK
4. Department of Population Health Sciences Bristol Medical School, University of Bristol Bristol UK
5. University Hospitals Bristol NHS Foundation Trust National Institute for Health Research Bristol Biomedical Research Centre University of Bristol Bristol UK