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 687 OP 687 DO 10.1503/cmaj.113-2116 VO 185 IS 8 YR 2013 UL http://www.cmaj.ca/content/185/8/687.3.abstract