Asked by Anonymous

why one group has placebo sprayed into their nostrils before exposure to virus

5 years ago

Answered by Writeacher

https://www.google.com/search?q=why+are+placebos+used&oq=why+are+placebos+used&aqs=chrome..69i57.18871j0j7&sourceid=chrome&ie=UTF-8

5 years ago

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