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Investigators conducted an experimental study of the effects of an investigational new drug to treat multiple sclerosis. The participants and the people assessing the effects

Investigators conducted an experimental study of the effects of an investigational new drug to treat multiple sclerosis. The participants and the people assessing the effects of the drug on the progression of multiple sclerosis did not know if participants were in the treatment or comparison group. What strategy to reduce bias is described here?

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