TY - RPRT TI - Fully automated analytical method for codeine quantification in human plasma using on-line solid-phase extraction and high-performance liquid chromatography with ultraviolet detection. AU - J A Pascual AU - J Sanagustín PY - 1999 DO - 10.1016/s0378-4347(99)00015-8 UR - https://pubmed.ncbi.nlm.nih.gov/10219671/ ID - 10219671 ER -