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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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Citation networks. (A) Citation network of the 132 most cited publications from 2003 to 2017. (B) Citation network of the 10 most cited publications from 2008 to 2012. The curves between the nodes suggest the citation relationships.