title: Direct radioimmunoassay and gas chromatography-mass spectrometry compared for determination of melatonin in plasma.
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008550:Melatonin / Q000097:blood*; D011863:Radioimmunoassay
chemical_list: D008550:Melatonin