using a combination of broad-specificity direct competitive enzyme-linked immunosorbent assay (dcELISA) and high-performance liquid chromatography–tandem mass spectrometry (HPLC–MS/MS) was developed
using a combination ofbroad-specificity direct competitive enzyme-linked immunosorbent assay (dcELISA) and high-performanceliquid chromatography–tandem mass spectrometry (HPLC–MS/MS) was developed