[Decrease of the incidence of bronchiectasis in children--a retrospective study on its etiology].
D000293:Adolescent; D001987:Bronchiectasis / Q000453:epidemiology / Q000209:etiology*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007564:Japan; D012141:Respiratory Tract Infections / Q000150:complications