Early signs of vitamin A deficiency in Bulgaria.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001206:Ascorbic Acid Deficiency / Q000150:complications; D002031:Bulgaria; D002338:Carotenoids / Q000097:blood; D002613:Cheilitis / Q000150:complications; D003623:Dark Adaptation; D005260:Female; D005882:Gingival Diseases / Q000150:complications; D006801:Humans; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D012257:Riboflavin Deficiency / Q000150:complications; D012737:Sex Factors; D012871:Skin Diseases / Q000150:complications; D014786:Vision Disorders / Q000150:complications; D014801:Vitamin A / Q000097:blood; D014802:Vitamin A Deficiency / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*
D014801:Vitamin A; D002338:Carotenoids