Figure 1From: Defining upper gastrointestinal bleeding from linked primary and secondary care data and the effect on occurrence and 28 day mortality Upper Gastrointestinal Bleed Events Defined in Linked HES and GPRD Data, England, 1997–2010. The percentages shown are of the combined unique events in box 1. GPRD- General Practice Research Database; HES - Hospital Episodes Statistics; ICD 10 - International Classification of Diseases 10th Edition; GI - Gastrointestinal; READ- Read code.Back to article page