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Another example of performance-based flexibility in Method TO-15 and Method TO-15A is that the target ion mass to charge ratio (m/z) in the analytical chromatogram selected to quantify EtO is not standardized across analytical laboratories (i.e., some laboratories use the 29 m/z ion rather than the 44 m/z ion to quantify EtO)
To take in account this variability, we performed a hierarchical meta-analysis considering the variance from UNAIDS regions and country level of income
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