Fig. 2
From: Medical 3D printing: methods to standardize terminology and report trends
Schematic representation of concept cluster analysis. Here, a literature corpus is represented on the left, with the concepts “A” and “B” always encountered together in published literature. This is reflected in these concepts closely clustering together on a proximity map. Concept “Z”, on the other hand, is isolated, and is well outside of the “AB” cluster on the map. Colors denote total concept use, with red reflecting maximal and green minimum use