RT Journal Article SR Electronic T1 Cognitive impairment behind the wheel JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1053 OP 1053 DO 10.1503/cmaj.111-2051 VO 183 IS 9 A1 Williams, Dorothy (Sam) YR 2011 UL http://www.cmaj.ca/content/183/9/1053.1.abstract