RT Journal Article SR Electronic T1 How to address the resurgence of syphilis in Canada JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1367 OP E1368 DO 10.1503/cmaj.191075 VO 191 IS 50 A1 Ameeta E. Singh YR 2019 UL http://www.cmaj.ca/content/191/50/E1367.abstract