John D Corson MBChB FRCS (Eng) FRCS (Edin) FACSClinical Professor, Department of Surgery, The University of New Mexico School of Medicine, Albuquerque, New Mexico; Former Professor of Surgery and Director of Vascular Surgery, The University of Iowa Hospitals and Clinics, Iowa City, Iowa, USARobin Williamson MD MChir FRCSEng FRCSEdFormer Professor and Director of Surgery, Hammersmith Hospital, London; Former President Royal Society of Medicine, Former President Association of Surgeons of Great Britain and Ireland, Former President International HepatoPancreatoBiliary Association, UK