Middle ear effusion and upper airway infection.
D002648:Child; D002675:Child, Preschool; D006801:Humans; D010033:Otitis Media / Q000209:etiology*; D010034:Otitis Media with Effusion / Q000209:etiology* / Q000628:therapy; D011446:Prospective Studies; D012141:Respiratory Tract Infections / Q000150:complications* / Q000628:therapy; D012189:Retrospective Studies