- Determination of urinary 12(S)-hydroxyeicosatetraenoic acid by liquid chromatography-tandem mass spectrometry with column-switching technique: sex difference in healthy volunteers and patients with diabetes mellitus. Suzuki, N., Hishinuma, T., Saga, T., Sato, J., Toyota, T., Goto, J., Mizugaki, M. J. Chromatogr. B Analyt. Technol. Biomed. Life Sci. (2003)