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. 2021 May 21;11:10716. doi: 10.1038/s41598-021-90054-4

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© The Author(s) 2021

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Representation of the IgA/EGFR correlation approach in a sample (grey), classified as anti-S IgG+ /IgA− by the ratio method, and a negative control (yellow). The linear regression graph shows IgA MFI versus EGFR MFI of both samples. The regression coefficient of the sample (grey) versus a negative control (yellow) demonstrate IgA seropositivity (R2 = 0.92 vs. R2 = 0.31).