RT Journal Article SR Electronic T1 Doctors question annual TB testing of health workers JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E904 OP E905 DO 10.1503/cmaj.109-5797 VO 191 IS 32 A1 Vogel, Lauren YR 2019 UL http://www.cmaj.ca/content/191/32/E904.abstract