1. School of Pharmacy, King George VI Building, Newcastle University, Newcastle, UK
2. Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle, UK
3. The Centre for Patient Safety Research and Practice, Division of General Internal Medicine and Primary Care, Brigham and Women’s Hospital, Boston, Massachusetts, USA
4. Partners HealthCare, Somerville, Massachusetts, USA
5. Eastern Research Group, Inc., Lexington, Massachusetts, USA
6. Harvard Medical School, Boston, Massachusetts, USA
7. Harvard School of Public Health, Boston, Massachusetts, USA