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Analyte extraction involved protein precipitation with acetonitrile and solid-phase extraction (SPE). Samples were analyzed using an Agilent 1290 infinity LC system in tandem with 6460A triple quadrupole mass spectrometers. The assay met FDA guideline-recommended requirements for specificity, sensitivity (analyte LLOQs 0.78-23.4 ng/mL), accuracy (intra-day RE% nominal concentration 90.7-110.2%; inter-day RE% 87.0-110.5%) and precision (intra-day analyte RSD% 0.46-11.4%; inter-day RSD% 1.36-11.2%). Recovery and matrix effects were thorou