RT Journal Article SR Electronic T1 Cobalamin deficiency in elderly patients JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 451 OP 451 DO 10.1503/cmaj.1041701 VO 172 IS 4 A1 Emmanuel Andrès YR 2005 UL http://www.cmaj.ca/content/172/4/451.1.abstract