The i2b2 Web Client is shown. The characteristic terms (and their respective modifiers) that describe the patients in the Clinical Research Chart are shown in the tree structure on the left. The query is composed in the upper right with the logic of a "Venn-Diagram". Terms in two different Groups will be logically ANDED together, and number of patients will be shown after computation, in this case the number of patients who are both male and have had appendicitis.
Bellazzi et al. BMC Bioinformatics 2012 13(Suppl 14):S1 doi:10.1186/1471-2105-13-S14-S1