1. Department of Health Professions, Manchester Metropolitan University, Elizabeth Gaskell Campus, Manchester, UK,
2. Taunton and Somerset NHS Trust, Musgrove Park Hospital, Taunton, MA, USA
3. Clinical Standards Department, Clinical Effectiveness and Evaluation Unit, Royal College of Physicians, Regent's Park, London, UK
4. Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK