Polymer monolith microextraction online coupled to hydrophilic interaction chromatography/mass spectrometry for analysis of β2-agonist in human urine

2009 ◽  
Vol 32 (11) ◽  
pp. 1965-1974 ◽  
Author(s):  
Ming-Ming Zheng ◽  
Man-Yu Zhang ◽  
Yu-Qi Feng
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