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STL (a), seasonality (b), and trends (c) of P. vivax among Thai citizens between 2012 and 2017 in Cluster I (1) and Cluster II (2). Color of box plot in b1 and b2: Blue represents the cold season, red represents the hot season, and green represents the rainy season. Note: Y-axes do not show equal values, which should be taken into consideration when performing comparisons. Incidence of trend in c1 is not exactly equal to zero, see Supplementary Figure S4.
