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Boxplots of monthly Japanese encephalitis cases across four seasons during the five study periods in Gansu Province, China (1968–1977, 1978–1987, 1988–1997, 1998–2007, and 2008–2017). The top and bottom of the box indicate the upper quartile (P75) and the lower quartile (P25), respectively; the line in the middle of the box represents the median value; and the top and bottom lines are minimum and maximum, respectively.
