The methods to measure stable isotope tracers and their applications to clinical nutrition problems keep getting better...
Matthews
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D008401:Gas Chromatography-Mass Spectrometry / Q000266:history; D049673:History, 20th Century; D006801:Humans; D007553:Isotope Labeling / Q000266:history; D007554:Isotopes / Q000032:analysis*; D013058:Mass Spectrometry / Q000266:history; D009747:Nutritional Physiological Phenomena
D007554:Isotopes