Genetic study of essential hypertension.
D000328:Adult; D000367:Age Factors; D000368:Aged; D001794:Blood Pressure; D004200:Diseases in Twins; D005260:Female; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D006973:Hypertension / Q000235:genetics*; D008297:Male; D008433:Mathematics; D008875:Middle Aged