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. 2019 Jun 4;9:8270. doi: 10.1038/s41598-019-44618-0

Figure 1.

Figure 1

A schematic illustration of the participant selection process that was used in the present study. Of a total of 1,125,691 participants, 5,200 SSNHL participants were matched with 20,800 control participants for age, group, sex, income group, region of residence, and past medical histories. Then, SSNHL and control participants were matched with the same meteorological data before the index date.