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(a) Serum sodium level; (b) Serum potassium level; (c) Serum chloride level; (d) Serum Na–Cl level; (e) Serum corrected calcium level; and (f) Serum phosphate level. Abbreviations: Serum Na-Cl level, difference between serum sodium and chloride concentrations; eGFR, estimated glomerular filtration rate.
