The etiologic role of acute suppurative otitis media in chronic secretory otitis.
D000158:Acoustic Impedance Tests; D002675:Child, Preschool; D002908:Chronic Disease; D003430:Cross-Sectional Studies; D006801:Humans; D008876:Middle Ear Ventilation; D010033:Otitis Media / Q000150:complications* / Q000209:etiology*; D010034:Otitis Media with Effusion / Q000150:complications*; D010035:Otitis Media, Suppurative / Q000209:etiology*