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Comparison of the extraction methods for assaying lopinavir/ritonavir and efavirenz in samples incurred from human hair. The methanol and enzyme digestion were carried out at 37°C with shaking in a water bath for 14 h. Data are represented by mean ± standard deviation (SD) (n = 4). *p <0.01, compared with cut hair/MeOH by t-test.
