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Folic acid supplementation, dietary folate intake during pregnancy and risk for spontaneous preterm delivery: a prospective observational cohort study.
Sengpiel V, Bacelis J, Myhre R, Myking S, Pay AD, Haugen M, Brantsæter AL, Meltzer HM, Nilsen RM, Magnus P, Vollset SE, Nilsson S, Jacobsson B. Sengpiel V, et al. Among authors: meltzer hm. BMC Pregnancy Childbirth. 2013 Aug 12;13:160. doi: 10.1186/1471-2393-13-160. BMC Pregnancy Childbirth. 2013. PMID: 23937678 Free PMC article. Retracted.
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