Clinical evaluation.
D000328:Adult; D001205:Ascorbic Acid / Q000378:metabolism; D044383:Black People; D003733:Dental Caries Susceptibility; D005227:Fatty Acids / Q000378:metabolism; D005891:Gingivitis / Q000453:epidemiology; D006306:Health Surveys; D006801:Humans; D007642:Keratosis / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009539:Nicotinic Acids / Q000378:metabolism; D010383:Pellagra / Q000453:epidemiology; D012257:Riboflavin Deficiency / Q000453:epidemiology; D012424:Rural Population; D012871:Skin Diseases / Q000453:epidemiology; D013019:South Africa; D014505:Urban Population; D014802:Vitamin A Deficiency
D005227:Fatty Acids; D009539:Nicotinic Acids; D001205:Ascorbic Acid