Once a vaccine is granted emergency approval, there is pressure to offer immunization to trial participants who received placebo. But

Once a vaccine is granted emergency approval, there is pressure to offer immunization to trial participants who received placebo. But if too many people cross over to vaccine group, companies might not have enough data to establish long-term outcomes,
nature.com/articles/d4158… https://t.co/UmW33iCr3l

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