%0 Journal Article %T Plasma Free Metanephrine Measurement Using Automated Online Solid-Phase Extraction HPLC–Tandem Mass Spectrometry %A , de JongWilhelmina HA %A Graham, Kendon, S %A , van der MolenJan C %A Links, Thera, P %A Morris, Michael, R %A Ross, H, Alec %A , de VriesElisabeth GE %A Kema, Ido, P %J Clinical Chemistry %V 53 %N 9 %@ 0009-9147 %D 2007-09-01 %I Oxford Academic %~ DeepDyve