Unanswered questions in the nutrition of elderly people.
D000368:Aged; D001206:Ascorbic Acid Deficiency / Q000453:epidemiology; D005260:Female; D005494:Folic Acid Deficiency / Q000453:epidemiology; D006801:Humans; D008286:Malabsorption Syndromes / Q000453:epidemiology; D008297:Male; D009748:Nutrition Disorders / Q000453:epidemiology* / Q000517:prevention & control; D009749:Nutrition Surveys; D014806:Vitamin B 12 Deficiency / Q000453:epidemiology