PT  - JOURNAL ARTICLE
AU  - Duong, Diana
TI  - Time for more effective masks?
AID  - 10.1503/cmaj.1095920
DP  - 2021 Feb 16
TA  - Canadian Medical Association Journal
PG  - E258--E258
VI  - 193
IP  - 7
4099  - http://www.cmaj.ca/content/193/7/E258.short
4100  - http://www.cmaj.ca/content/193/7/E258.full
SO  - CMAJ2021 Feb 16; 193