1. Department of Non-Communicable Disease Epidemiology, Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK
2. Clinical Practice Research Datalink (CPRD), Medicines and Healthcare Products Regulatory Agency, London, UK
3. Department of Emergency Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
4. Institute of Health Economics and Clinical Epidemiology, University Hospital of Cologne, Cologne, Germany
5. Department of Medicine, The Royal Marsden NHS Foundation Trust, London and Surrey, UK