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. 2020 Aug 5;15:5503–5516. doi: 10.2147/IJN.S253599

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© 2020 Zhu et al.

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Major topics for the nanoparticles in pancreatic cancer. (A and B) Visualization of keyword ranking based on the carrot system. The larger the weight of the topic, the larger the area, and the more central the module. (C) Density visualization. (D) Keyword co-occurrence map visualization. Bubble chart visualized 219 keywords. The minimum number of occurrences of a keyword was set as 10. The bigger the bubble, the higher the frequency. Furthermore, the closer the proximity, the higher the frequency.