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. 2020 Mar 17;10:4900. doi: 10.1038/s41598-020-61829-y

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© The Author(s) 2020

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Positions of real clusters. Subfigure (a) is the position of real clusters with 16 counties for each in Kulldorff’s benchmark datasets and the solid triangles are the centres for the three types of clusters such as those located in rural, mixed and urban areas. Subfigure (b) shows the positions of the real clusters in the additional scenario in which the clusters are not far away from each other.