费城的新口罩要求能遏制疫情的激增吗？ 科学家们发表意见。
August 12, 2021
Usama Bilal, PhD, MD, an assistant professor in the Dornsife School of Public Health, was quoted in an Aug. 12 article in The Philadelphia Inquirer, which also ran in the Philadelphia Daily News, about Philadelphia’s new mask mandate to combat the coronavirus.
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