1. Florence Nightingale Faculty of Nursing, Midwifery and Palliative Care, King's College London, London, UK
2. Guy's and St Thomas’ NHS Foundation Trust, London, UK
3. Institute of Cardiovascular Science, University College London, London, UK
4. School of Nursing, University of Hong Kong, Hong Kong
5. Warwick Clinical Trials Unit, University of Warwick, Coventry, UK