label: Column chromatography/mass spectrometry (eg, GC/MS, or HPLC/MS), non-drug analyte not elsewhere specified; stable isotope dilution, multiple analytes, quantitative, single stationary and mobile phase
label_lc: column chromatography/mass spectrometry (eg, gc/ms, or hplc/ms), non-drug analyte not elsewhere specified; stable isotope dilution, multiple analytes, quantitative, single stationary and mobile phase