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. 2019 Feb 26;19:66. doi: 10.1186/s12887-019-1438-2

Fig. 2.

Fig. 2

Scatterplot - Matching KD and control cases by age at the onset of fever in KD cases. One dot meets a matched pair. Dots that are below the red line were excluded. It is noticeable that most dots are on or next to the diagonal. Consequently, a successful matching based on age can be assumed