Fig. 4

Drug clusters under different clinical conditions in the children’s hospital. a. Plot of multidimensional scaling (MDS) of the drug-drug distance matrix in 2D colored by cluster (cluster 13, an outlier, is not shown in this view). The size of each drug cluster is plotted as bar chart on the right side. b. The hierarchy of the 18 drug clusters is measured based on the distance of the associated diagnosis sets for each drug cluster