<Journal class="Journal" value="Journal of Chromatography B Analyt Technol Biomed Life Sciences" /> <Page class="#txt" value="783"> <Page-2 class="#txt" value="8" /> </Page> <Volume class="#txt" value="879" /> <Year class="Year" value="2011" /> </Reference> <Author class="Author" value="Zhu HJ" /> <Author class="Author" value="Patrick KS" /> <Author class="Author" value="Markowitz JS" /> <Medline class="Medline" value="21402502" /> <Abstract class="LongText" value="Zhu_2011_J.Chromatogr.B.Analyt.Technol.Biomed.Life.Sci_879_783" /> <Substrate class="Substrate" value="Methylphenidate" /> </Paper>