Low maternal vitamin B<sub>12</sub> is a risk factor for neural tube defects: a meta-analysis.
Wang, Zhi-Ping; Shang, Xiao-Xiao; Zhao, Zhong-Tang; Journal of Maternal-Fetal & Neonatal Medicine, 2012, vol. 25, issue 4, p 389, ISSN 14767058. ISBN 14764954.

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