DM Midha (Presenting Author) – Royal Free Hospital NHS Foundation Trust, London, UK; MA Ahmad – Royal Free Hospital NHS Foundation Trust, London, UK; HF Fayed – Royal Free Hospital NHS Foundation Trust, London, UK; JGC Coghlan – Royal Free Hospital NHS Foundation Trust, London, UK; BS Schreiber – Royal Free Hospital NHS Foundation Trust, London, UK; CD Denton – Royal Free Hospital NHS Foundation Trust, London, UK; RK Khiani – Royal Free Hospital NHS Foundation Trust, London, UK