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Mu D, Fang J, Yu S, Ma Y, Cheng J, Hu Y, Song A, Zhao F, Zhang Q, Qi Z, Zhang K, Xia L, Qiu L, Zhu H, Cheng X.  Comparison of Direct and Extraction Immunoassay Methods With Liquid Chromatography-Tandem Mass Spectrometry Measurement of Urinary Free Cortisol for the Diagnosis of Cushing’s Syndrome.  Ann Lab Med 2024;44:29-37.  https://doi.org/10.3343/alm.2024.44.1.29