TY - JOUR T1 - Neural tube defects JF - Canadian Medical Association Journal JO - CMAJ SP - 160 LP - 160 DO - 10.1503/cmaj.1041541 VL - 172 IS - 2 AU - Joel G. Ray Y1 - 2005/01/18 UR - http://www.cmaj.ca/content/172/2/160.1.abstract ER -