RT Journal Article SR Electronic T1 Health care workers must protect patients from influenza by taking the annual vaccine JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1873 OP 1873 DO 10.1503/cmaj.121679 VO 184 IS 17 A1 Ken Flegel YR 2012 UL http://www.cmaj.ca/content/184/17/1873.abstract