%0 Journal Article %J Analytical Chemistry %D 2007 %T Relative quantification of carboxylic acid metabolites by liquid chromatography - Mass spectrometry using isotopic variants of cholamine %A Lamos, Shane M. %A Shortreed, Michael R. %A Frey, Brian L. %A Belshaw, Peter J. %A L. M. Smith %B Analytical Chemistry %V 79 %P 5143-5149 %8 Jul %G eng %R 10.1021/ac062416m %F ISI 2007 09 14