Analysis of β-agonists and β-blockers in urine using hollow fibre-protected liquid-phase microextraction with in situ derivatization followed by gas chromatography/mass spectrometry

2009 ◽  
Vol 1216 (28) ◽  
pp. 5340-5346 ◽  
Author(s):  
Wei Liu ◽  
Lan Zhang ◽  
Zhenyi Wei ◽  
Shengping Chen ◽  
Guonan Chen
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