The serum vitamin B12 concentration in the general population.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D000383:Agriculture; D001769:Blood; D004032:Diet; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008906:Mining; D012723:Sex; D006113:United Kingdom; D014805:Vitamin B 12 / Q000378:metabolism*; D014806:Vitamin B 12 Deficiency / Q000453:epidemiology*
D014805:Vitamin B 12