title: Trends of folate and vitamin B12 during pregnancy.
mesh_terms: D000328:Adult; D001938:Brazil; D005260:Female; D005492:Folic Acid / Q000097:blood; D005494:Folic Acid Deficiency / Q000097:blood / Q000453:epidemiology*; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology*; D014805:Vitamin B 12 / Q000097:blood; D014806:Vitamin B 12 Deficiency / Q000097:blood / Q000453:epidemiology*
chemical_list: D005492:Folic Acid; D014805:Vitamin B 12