TY - JOUR A1 - Šípek, A. A1 - Horáček, J. A1 - Gregor, V. A1 - Rychtaříková, J. A1 - Dzúrova, D. A1 - Mašátová, D. T1 - Neural tube defects in the Czech Republic during 1961-1999: Incidences, prenatal diagnosis and prevalences according to maternal age Y1 - 2002a JF - Journal of Obstetrics & Gynaecology VL - 22 IS - 5 SP - 501 EP - -507 ER -