Letter: Sick role, status, and acute respiratory illness.
D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D004493:Education; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012140:Respiratory Tract Diseases / Q000453:epidemiology*; D012380:Role; D012737:Sex Factors; D012959:Socioeconomic Factors