RT Journal Article SR Electronic T1 Influenza vaccine efficacy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 438 OP 438 DO 10.1503/cmaj.115-0021 VO 187 IS 6 A1 Cimolai, Nevio YR 2015 UL http://www.cmaj.ca/content/187/6/438.1.abstract