SPE-UHPLC-ESI-MS/MS Analysis of Cocaine and Its Metabolites in Conventional and Alternative Biological Specimens: Application to Real Samples by Humera Shafi Makhdoom, Saira Afzal, Kishwar Sultana, Syed Nisar Hussain Shah, Majida Mujahid, Zulfiqar ul Hassan, Farida Munir, Faryal Jahan, Zeerak Abbas, Ali Imran Abid, Najm ul Hassan Khan

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