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In some filters there is a heading in italics and underlined , for example the Cardiovascular Disease (CVD) and Bone Disease in the screenshot above. Selecting this heading will create a filter for patients with any of the specific conditions listed below, in this case CHC, Stroke, MI, PVD, Carotid Stenosis and Renal Artery Stenosis. This is an OR search, meaning that all patients with at least one of the listed conditions will be shown.