Umbrella systematic review of potential quality indicators for the detection of dysplasia and cancer at upper gastrointestinal endoscopy by Umair Kamran, Abdullah Abbasi, Nosheen Umar, Imran Tahir, Matthew J Brookes, Matt Rutter, Mimi McCord, Nicola J Adderley, Janine Dretzke, Nigel Trudgill

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