Nutritional deficiencies among the elderly.
D000368:Aged; D000369:Aged, 80 and over; D001361:Avitaminosis / Q000276:immunology; D003677:Deficiency Diseases / Q000276:immunology*; D006801:Humans; D007111:Immunity, Cellular; D007694:Killer Cells, Natural / Q000276:immunology*; D012643:Selenium / Q000172:deficiency; D015032:Zinc / Q000172:deficiency
D012643:Selenium; D015032:Zinc