Influence of environment on clinical trachoma in Saudi Arabia.
D000293:Adolescent; D000328:Adult; D001083:Arabia; D002648:Child; D002921:Cicatrix; D003315:Cornea / Q000503:physiopathology; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D010808:Physical Examination; D012959:Socioeconomic Factors; D014141:Trachoma / Q000453:epidemiology*