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並前往https://www.npr.org/sections/health-shots/2021/02/19/969143015/long-term-studies-of-covid-19-vaccines-hurt-by-placebo-recipients-getting-immuni

Long-Term Studies Of COVID-19 Vaccines Hurt By Placebo ...

But clinical trials that include a placebo group are the surest and most definitive ways to gather information about vaccine effectiveness. "I ...

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