TNTDPTexas Neural Tube Defect Project
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Each woman identified through the TNTDP surveillance protocol was at risk for recurrence and could not have been enrolled in the folic acid intervention program without being identified through surveillance.
Findings from the 1993-1998 recurrence period showed that only 9% of El Paso County women who delivered normal live-born infants reported taking periconceptional folic acid (TNTDP, unpublished data, 1999).
surveillance systems [4,5], since its inception the TNTDP has included cases at [less than]20 weeks' gestational age.