[Epidemiology of fatty liver--ultrasound mass survey in a rural region].
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005234:Fatty Liver / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008403:Mass Screening / Q000379:methods*; D008875:Middle Aged; D012424:Rural Population; D014463:Ultrasonography