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In the U.S., harm reduction for drugs had a more contested policy history, as a group of experts wrote in a comparison of vaping policies in the U.S., the U.K., and Australia

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has widely exhibited, had film screenings and performed throughout Europe, Cuba and South America, and the US

Clinically relevant metrics include sensitivity and specificity, with sensitivity having the same definition as recall and specificity being defined as the number of true negatives for a given category divided by all negatives as assessed by EP for that category