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Unpruned dendrogram of hierarchical clustering on the swollen joint manifestations in patients with definite PsA [16]. The first split occurs between the large oligoarticular cluster (red) and the rest. Then, at a distance of about 350, the feet-dominated cluster (blue) is separated from the rest, followed by the split into the polyarticular (green) and hand-dominated clusters (purple) at a distance of about 170 (colour figure online)
