Why opioid overdose deaths seem to happen in spurts

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But we shouldn't assume that such deaths are necessarily linked, cautioned Nicholas King, an associate professor at McGill University in Montreal who has studied the factors behind increased opioid-related deaths in the United States and Canada. "We know from historical experience with so-called 'cancer clusters' that in many cases the clustering is either the result of confirmation bias, or is simply the result of random chance," he said.

Read more: CNN

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