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Fig. 2 | Respiratory Research

Fig. 2

From: Exposure to PM2.5 is a risk factor for acute exacerbation of surgically diagnosed idiopathic pulmonary fibrosis: a case–control study

Fig. 2

Demographic data and geographic location of the 33 hospitals. The demographic data in 2015 in Japan is shown in different colors for each prefecture. The numbers on the top left represent the population and correspond to each color. The black boxes indicate the geographic location of 33 Japanese hospitals participating in the present study

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Respiratory Research

ISSN: 1465-993X

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