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APA Citation
Ellefsen, K. N., Concheiro, M., Pirard, S., Gorelick, D. A., & Huestis, M. A. (n.d.). cocaine and benzoylecgonine oral fluid on‐site screening and confirmation. Drug testing and analysis, 8(3), 296–303. http://access.bl.uk/ark:/81055/vdc_100070764665.0x000016