Cotton and Williams' Practical Gastrointestinal Endoscopy
Catharine M. Walsh, Ahmir Ahmad, Brian P. Saunders, Jonathan Cohen, Peter B. Cotton, Christopher B. Williams, Canada) Walsh, Catharine M. (University of Toronto, Toronto, UK) Ahmad, Ahmir (St. Mark's Hospital, London, UK) Saunders, Brian P. (St. Mark's Hospital, London, USA) Cohen, Jonathan (NYU Grossman School of Medicine, New York, USA) Cotton, Peter B. (Medical University of South Carolina, SC, UK) Williams, Christopher B. (St. Mark's Hospital, London
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