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. 2019 Jan 24;9:581. doi: 10.1038/s41598-018-36962-4

Figure 1.

Figure 1

Photographs of smear papers: smear paper nos 1 (a), 2 (b), 3 (c), and 4 (d). The photo in no.1 (a) was taken before cutting the outer periphery, but actually, all smear papers were subjected to the same conditions during measurement.