DOI: 10.1055/s-00000020

Geburtshilfe und Frauenheilkunde

References

Adams MJ, Khoury MJ, Scanlon KS, Stevenson RE, Knight GJ, Haddow JE, Sylvester GC, Cheek JE, Henry JP, Stabler SP. et al.
Elevated midtrimester serum methylmalonic acid levels as a risk factor for neural tube defects. 
Teratology 1995; 51: 311-317  

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