1. Adult Nursing and Paramedic Science, The University of Greenwich and Barts Health NHS Trust, The University of Greenwich, Southwood Site, London SE9 2UG, UK
2. Centre for Implementation Science, Health Service and Population Research Department, Institute of Psychiatry, Psychology & Neuroscience (IoPPN), King's College London, NIHR CLAHRC South London, 16 De Crespigny Park, London SE5 8AF, UK
3. Senior Clinical Fellow, Department of Primary Care and Public Health, Imperial College London, The Reynolds Building, St Dunstan's Road, London W6 8RP, UK