Participating Study Centres Barts Health NHS Trust Cardiff and Vale University Health Board Nottingham University Hospitals NHS Trust University Hospitals of Leicester NHS Trust Portsmouth Hospital University NHS Trust Barking, Havering, and Redbridge University Hospitals NHS Trust University College London Hospitals NHS Foundation Trust Manchester University NHS Foundation Trust University Hospitals Dorset NHS Foundation Trust Imperial College Healthcare NHS Trust University Hospitals Sussex NHS Foundation Trust University Hospitals Bristol and Weston NHS Foundation Trust Oxford University Hospitals NHS Foundation Trust Map of recruitment sites