Figure 4: Screenshot of the CQL Web Client. On the left is the code editor, where CQL queries are formulated. Define statements that return a Boolean value can be executed to filter the data. The result of a query is displayed in the right panel. At the top is the sex distribution, and next to it is the age distribution. In the middle is the Kaplan-Meier survival curve of the queried cohort, and below that is the visualization of treatment pathways in a Sankey plot.