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Correlation between ELISA and MSD electrochemiluminescence assays of plasma (A) Aβ40, (B) Aβ42, and (C) Aβ42/40 ratio. Spearman rank correlation coefficients (A) Aβ40 r = 0.56, p < 0.0001; Aβ42 r = 0.32, p = 0.003; Aβ42/40 ratio r = 0.29, p = 0.005.
