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Table 1 Summary of group definition by risk exposure and the used personal protection equipment

From: High class filtering facepiece (FFP) are fundamental and effective in protection of emergency health care workers: an observational cohort study in a German community

  1. surgical mask; FFP2/N95 or FFP3/N99 face mask; protective gown;
  2. protective head; glasses; gloves; EMS: emergency medical service, HS hospital staff, NPC non-patient contact staff, ENT ear neck throat specialist, ICU intensive care unit