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. 2022 Jul 7;10:915648. doi: 10.3389/fchem.2022.915648

FIGURE 2.

FIGURE 2

Visualization of the co-occurring subject categories network. (Nodes represent subject categories. The size of a node is proportional to the literature number of the subject category. The links represent the co-occurring relationship between different subject categories. The color of the rings and links corresponds to the year. The purple rings indicate high centrality.)