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3. Preventing the Soldiers of Health Care From Becoming Victims on the Pandemic Battlefield: Respirators or Surgical Masks as the Armor of Choice
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5. Center for Disease Control and Prevention: “Ancilliary Respirator Information.” Available at http://www.cdc.gov/niosh/npptl/topics/respirators/disp_part/respsource3additional.html (accessed November 23, 2016).