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Periconceptional folic acid has been associated with a reduced risk of neural tube defects, but findings on its effect in oral clefts are largely inconclusive. This case-control study assesses the(More)
The Eurocat registry Northern Netherlands (NNL) has been used in regional context, as well as in national/international context, to describe the epidemiology of oral clefts (OC). However, the region(More)
BACKGROUND Oral clefts-comprising cleft lip (CL), cleft lip with cleft palate (CLP), and cleft palate (CP)-are being diagnosed prenatally more frequently. Consequently, the need for accurate(More)
OBJECTIVE Since 1997, common oral clefts in the Netherlands have been recorded in the national oral cleft registry using a unique descriptive recording system. This study validates data on the(More)
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