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The presence of azithromycin in the human plasma of pediatric patients was determined with a UHPLC‐MS/MS assay. Sample preparation was done by protein precipitation, and the separation was achieved on a C18 column by the gradient mixture of the mobile phase A (0.1% acetic acid and 3 mM ammonium acetate in water) and the mobile phase B (0.1% acetic acid and 3 mM ammonium acetate in the solution of...
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