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. 2021 Nov 5;42(4):1121–1131. doi: 10.1007/s10792-021-02098-0

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© The Author(s) 2021

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Fig. 5 — The co-occurrence analysis visualization of keywords in PubMed. The node size is determined by the number of published articles. In co-occurrence analysis, the relatedness of items is determined based on the number of documents they occur together. The links between nodes represent relatedness. The color of a node represents the cluster it belongs to, and different clusters are represented by different colors