H Langridge (Presenting Author) – Barts Heath NHS Trust, London, UK; C Monkhouse – Barts Health NHS Trust, London, UK; S John – Barts Health NHS Trust, London, UK; R Schilling – Barts Health NHS Trust, London, UK; M Lowe – Barts Health NHS Trust, London, UK; A Chow – Barts Health NHS Trust, London, UK