Helium wash-out curves in population studies.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D004812:Epidemiologic Methods; D005260:Female; D006371:Helium; D006801:Humans; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D012111:Residence Characteristics; D012129:Respiratory Function Tests
D006371:Helium