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Barenholtz, Elan and Krotulski, Alex J and Morris, Paul and Fitzgerald, Nicole D and Le, Austin and Papsun, Donna M and Logan, Barry K and Hahn, William E and Goldberger, Bruce A and Cottler, Linda B and Palamar, Joseph J (2021) Online surveillance of novel psychoactive substances (NPS): monitoring Reddit discussions as a predictor of increased NPS-related exposures. International Journal of Drug Policy, 98, 103393. doi: 10.1016/j.drugpo.2021.103393.