RT Journal Article SR Electronic T1 Folic acid supplementation: more work is needed JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1129 OP 1129 VO 163 IS 9 A1 Natalie K. Björklund A1 Jane A. Evans A1 Cheryl R. Greenberg YR 2000 UL http://www.cmaj.ca/content/163/9/1129.1.abstract