Ultrasound-assisted dispersive liquid-liquid microextraction for the determination of seven recreational drugs in human whole blood using gas chromatography–mass spectrometry. - Lin, Zebin; Li, Jiaolun; Zhang, Xinyu; Qiu, Meihong; Huang, Zhibin; Rao, Yulan (Journal of Chromatography B: Analytical Technologies in the Biomedical & Life Sciences, 2017)