Objective To study the variation trend in incidence of neural tube defects (NTDs) during 1988 to 1992 in China.
目的了解1988～1992年我国神经管缺陷（NTD）发生率的变化趋势。
Objective To explore relationship between methylenetetra hydrofolate reductase (MTHFR) polymorphism and neural tube defects (NTDs)of women in the northern countryside.
目的探讨北方乡村妇女亚甲基四氢叶酸还原酶（MTHFR）基因多态性与神经管畸形的关系。
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