[How normal is 'normal'?].
D000293:Adolescent; D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000453:epidemiology*; D001774:Blood Chemical Analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009098:Multiphasic Screening; D012016:Reference Values
Hoe normaal is 'normaal'?