title: [At HUG, visitors must wear a mask].
authors.forename: Sophie
authors.initials: S
authors.lastname: Davaris
mesh_terms: D006785:Hospitals, University; D006801:Humans; D017053:Infection Control / Q000379:methods*; D007251:Influenza, Human / Q000517:prevention & control*; D008397:Masks / Q000706:statistics & numerical data*; D013557:Switzerland