RT Journal Article SR Electronic T1 Neural tube defects JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 158 OP 158 DO 10.1503/cmaj.1041688 VO 172 IS 2 A1 Fu-Lin Wang A1 Hude Quan A1 Donald Schopflocher YR 2005 UL http://www.cmaj.ca/content/172/2/158.1.abstract