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Dendrogram of PD patients clustered according to vertex‐by‐vertex information of cortical thickness. The distance along the y axis represents the similarity between clusters so that the shorter the distance, the greater the similarity. Numbers on the horizontal axis represent the 88 PD patients included in the cluster analysis. P1, Pattern 1; P2, Pattern 2; P3, Pattern 3. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]
