Tim Raine, Registrar, Gastroenterology and General Medicine, Eastern Deanery, Clinical Fellow, Wellcome Trust, UK

Katherine McGinn, Core Trainee, ACCS (Emergency Medicine), Wessex Deanery, UK

James Dawson, Registrar, Anaesthesia, East Midlands Deanery, UK

Stephan Sanders, Postdoctoral Associate in Neurogenetics, Yale University, USA Expedition Doctor, BBC, USA

Simon Eccles, Medical Director, NHS Connecting for Health Clinical Lead in Emergency Medicine, Homerton University Hospital, London, UK

Oxford University Press makes no representation, express or implied, that the drug dosages in this book are correct. Readers must therefore always check the product information and clinical procedures with the most up to date published product information and data sheets provided by the manufacturers and the most recent codes of conduct and safety regulations. The authors and the publishers do not accept responsibility or legal liability for any errors in the text or for the misuse or misapplication of material in this work.