title: [Serum folic acid and vitamin B12 levels in normal adults in Beijing].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000749:Anemia, Megaloblastic / Q000097:blood; D001681:Biological Assay; D002681:China; D005260:Female; D005492:Folic Acid / Q000097:blood*; D006801:Humans; D007778:Lactobacillus / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D005492:Folic Acid; D014805:Vitamin B 12