TY - JOUR AU - Jeanice Brown AU - Katherine Sharpless AU - S. Mitvalsky AU - Mark Roman AU - James Yen AU - Mary Satterfield C2 - Journal of Aoac International DA - 2007-04-24 LA - en M1 - 90 PB - Journal of Aoac International PY - 2007 TI - Determination of Caffeine, and Caffeine-Related Metabolites in Ephedra-Containing Standard Reference Materials Using Liquid Chromatography With Absorbance Detection and Tandem Mass Spectrometry ER -