RT Journal Article SR Electronic T1 The surgical mask is a bad fit for risk reduction JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 606 OP 607 DO 10.1503/cmaj.151236 VO 188 IS 8 A1 Shane Neilson YR 2016 UL http://www.cmaj.ca/content/188/8/606.abstract AB