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Gilman, Jodi M and Schmitt, William A and Wheeler, Grace and Schuster, Randi M and Klawitter, Jost and Sempio, Cristina and Evins, A Eden (2021) Research letter: Variation in cannabinoid metabolites present in the urine of adults using medical cannabis products in Massachusetts. JAMA Network Open , 4 , (4) , e215490.