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But we shouldn't assume that such deaths are necessarily linked, cautioned聽Nicholas King, an associate professor at 9I制作厂免费 in Montreal who has studied the factors behind聽increased opioid-related deaths聽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.

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