Irfan Syed BSc MBBS(Lon) MRCS DO-HNS, Specialist Registrar ENT Surgery South West England Training Rotation "Zishan Syed MDCH MA MB BChir (University of Cambridge), Foundation Year 2 Doctor, Kent and Sussex Hospital " Editorial Advisor: Aroon Hingorani MA FRCP PhD, BHF Senior Fellow, Reader and Honorary Consultant Physician, BHF Laboratories, University College London, Centre for Clinical Pharmacology, Department of Medicine, London, UK