TY - JOUR T1 - Are 'upper' and 'lower' neural tube defects aetiologically different? JF - Journal of Medical Genetics JO - J Med Genet SP - 503 LP - 504 DO - 10.1136/jmg.25.7.503-a VL - 25 IS - 7 AU - M F Frecker AU - F C Fraser AU - W D Heneghan Y1 - 1988/07/01 UR - http://jmg.bmj.com/content/25/7/503.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -