RT Journal Article SR Electronic T1 Neural tube defects JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 158 OP 159 DO 10.1503/cmaj.1041602 VO 172 IS 2 A1 Heather Dean A1 Kelly Watson A1 Elizabeth A.C. Sellers YR 2005 UL http://www.cmaj.ca/content/172/2/158.3.abstract