Ulat mula sa Welsh Government, na pinamagatang Review of Face Covering (Masks) Wearing as a Behavioral Intervention to Control the SARS-CoV-2 Virus Spread, dated 20/01/2021.
Ulat mula sa Welsh Government, na pinamagatang Review of Face Covering (Masks) Wearing as a Behavioral Intervention to Control the SARS-CoV-2 Virus Spread, dated 20/01/2021.