Multiclass screening in urine by comprehensive two-dimensional liquid chromatography time of flight mass spectrometry for residues of sulphonamides, beta-agonists and steroids

• Marco BloklandWageningen University & Research
• Paul W. ZoontjesWageningen University & Research
• L.A. van GinkelWageningen University & Research
• Milou G.M. van de SchansWageningen University & Research
• Saskia S. SterkWageningen University & Research
• Toine F. H. BoveeWageningen University & Research