1. School of Pharmacy, Newcastle University, Newcastle upon Tyne, UK
2. Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
3. The Center 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. Harvard Medical School, Harvard University, Boston, Massachusetts, USA
6. Harvard School of Public Health, Harvard University, Boston, Massachusetts, USA