[Study on classification of essential hypertension according to its severity].
D000328:Adult; D000368:Aged; D001794:Blood Pressure; D005260:Female; D005654:Fundus Oculi; D006801:Humans; D006973:Hypertension / Q000145:classification* / Q000175:diagnosis; D007677:Kidney Function Tests; D008297:Male; D008875:Middle Aged; D011379:Prognosis