RT Journal Article SR Electronic T1 Periodic health examination, 1991 update: 1. Screening for cognitive impairment in the elderly. Canadian Task Force on the Periodic Health Examination JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 425 OP 431 VO 144 IS 4 YR 1991 UL http://www.cmaj.ca/content/144/4/425.abstract