Stable isotope dilution high-performance liquid chromatography–electrospray ionization mass spectrometry method for endogenous 2- and 4-hydroxyestrones in human urine

2002 ◽  
Vol 780 (2) ◽  
pp. 315-330 ◽  
Author(s):  
Xia Xu ◽  
Regina G Ziegler ◽  
David J Waterhouse ◽  
Joseph E Saavedra ◽  
Larry K Keefer
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