T P Hellyer1, T Mantle2, R McMullan3, P Dark4,5. 1. Newcastle University, Newcastle, UK. 2. Manchester Medical School, Manchester, UK. 3. Belfast Health & Social Care Trust and Reader, Centre for Experimental Medicine, Queen's University Belfast, Belfast, UK. 4. Manchester NIHR Biomedical Research Centre, University of Manchester, Manchester, UK. 5. Northern Care Alliance NHS Group, Greater Manchester, UK.