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Percentage of samples negative for any drug (A), percentage of samples positive for heroin (B), cocaine (C), MDMA (D), cannabis (E) and benzodiazepines (BZDs) (F) according to the analysis before (December 2019, March 2020 as reference), during (June 2020) and after (September 2020) Italy’s first wave of the COVID-19 pandemic. Coefficients of the generalized linear model (GLM) and relative p-values (in brackets) are reported above the histogram bars.
