1. Psychology Department, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
2. St Mark's Hospital, The National Bowel Hospital and Academic Institute, London North West Hospitals NHS Trust, London, UK
3. Barts and the London Pragmatic Clinical Trials Unit (PCTU), Queen Mary University of London, London, UK
4. Florence Nightingale Faculty of Nursing, Midwifery & Palliative Care, London, King's College London, London, UK