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- [22] AN IMPROVED ASSAY OF URINARY CATECHOLAMINE METABOLITES, 3-METHOXY-4-HYDROXYPHENYLGLYCOL AND VANILLYLMANDELIC ACID, USING HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY WITH ELECTROCHEMICAL DETECTION JOURNAL OF LIQUID CHROMATOGRAPHY, 1993, 16 (06): : 1329 - 1340