Serum-vitamin-B12 concentration in the elderly.
D000368:Aged; D045728:Corrinoids; D005853:Geriatrics / Q000097:blood*; D006801:Humans; D014805:Vitamin B 12 / Q000097:blood*; D014803:Vitamin B Complex; D014815:Vitamins
D045728:Corrinoids; D014815:Vitamins; D014803:Vitamin B Complex; D014805:Vitamin B 12
GERIATRICS/blood; VITAMIN B 12/blood