An epidemiological study of polycythemia vera.
D000328:Adult; D001741:Black or African American; D000368:Aged; D005260:Female; D006801:Humans; D007585:Jews; D008297:Male; D008396:Maryland; D008875:Middle Aged; D011087:Polycythemia Vera / Q000453:epidemiology*; D013223:Statistics as Topic