RT Journal Article SR Electronic T1 Neurocognitive and psychiatric changes as the initial presentation of neurosyphilis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 499 OP 503 DO 10.1503/cmaj.121146 VO 185 IS 6 A1 Cecilia T. Costiniuk A1 Paul A. MacPherson YR 2013 UL http://www.cmaj.ca/content/185/6/499.abstract