School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, United Kingdom; Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, United Kingdom; Public Health Scotland, Glasgow, United Kingdom. Electronic address: Hamish.innes@gcu.ac.uk. Medical Department 1, University Hospital Dresden, Technical University of Dresden, Dresden, Germany. Peter Medawar Building for Pathogen Research, Nuffield Department of Medicine, Oxford University, Oxford, United Kingdom; Oxford NIHR Biomedical Research Centre, Oxford University, Oxford, United Kingdom. Oxford Liver Unit, Translational Gastroenterology Unit, Oxford University Hospitals National Health Service Foundation Trust, University of Oxford, Oxford, United Kingdom. Department of Gastroenterology and Hepatology, University Hospital of Zurich, Zurich, Switzerland.