[Study on acute respiratory tract infections in children. 1. Clinical epidemiological study on acute respiratory tract infections in children].
D000208:Acute Disease; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012141:Respiratory Tract Infections / Q000453:epidemiology*; D012621:Seasons; D012737:Sex Factors; D014041:Tokyo; D014777:Virus Diseases / Q000453:epidemiology; D014887:Weather