Affiliation: | Speciality Registrar in Anaesthesia, Sheffield Teaching Hospitals NHS Trust, Sheffield, UK;Specialist Registrar in Anaesthesia, Sheffield Teaching Hospitals NHS Trust, Sheffield, UK;Clinical Senior Lecturer in Medical Biochemistry and Metabolic Medicine, Department of Infection, Immunity and Biochemistry, Cardiff University, Heath Park, Cardiff CF14 4XW, UK;Consultant Anaesthetist, Sheffield Teaching Hospitals NHS Trust, Northern General Hospital, Herries Road, Sheffield S5 7AU, UK |