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The figure illustrates correlation coefficients for CSF metal/metalloids in ALS cases (A) and healthy controls (B). Significant correlations (p < 0.05) were found for the following metals: Cu/Ni, Cu/As, Ni/As, Fe/Cu, Fe/Ni, and Fe/As (ALS) as well as Cu/As (control). Thresholds of significance are as follows: 0.85 for healthy controls and for 0.3 for ALS cases.
