#askHKUMed on COVID-19: Should masks be used by seemingly healthy people?

#askHKUMed, should masks be used by seemingly healthy people?
#askHKUMed on COVID-19: Should masks be used by seemingly healthy people?
#askHKUMed on COVID-19: Should masks be used by seemingly healthy people?
#askHKUMed on COVID-19: Should masks be used by seemingly healthy people?

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