1. University of Michigan School of Medicine, Ann Arbor, MI
2. Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD
3. The Johns Hopkins Hospital, Baltimore, MD
4. University Health Board, Glan Clwyd Hospital, Denbighshire, UK
5. Centre for Population Health Sciences, Edinburgh, UK
6. National Patient Safety Agency, London, UK
7. Bloomberg School of Public Health, Baltimore, MD
8. National Health Service Foundation Trust, London, UK