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Dr. Elizabeth A. Halloran
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Elizabeth A. Halloran
Internal Medicine
410-637-5700
815 E Pratt St
Baltimore, MD 21202
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Last Updated: 09/26/2026
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Placebo-Controlled Trials of Covid-19 Vaccines - Why We Still Need Them.
Placebo-Controlled Trials of Covid-19 Vaccines - Why We Still Need Them.
Journal:
The New England journal of medicine
Published:
December 02, 2020
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Last Updated: 09/26/2026