[British Medical Journal Publishing Group The APM’s Annual Supportive and Palliative Care Conference, In association with the Palliative Care Congress, “Towards evidence based compassionate care”, Bournemouth International Centre, 15–16 March 2018 - ()] Poster presentations - 47 Developing a study intervention: a realist review and consensus workshops to develop the namaste care intervention for people with advanced dementia prior to a feasibility study using a cluster randomised controlled trial in nursing care homes