Bruce, I.

tympanic membrane retraction membrane patient atelectasi tympanic erosion surgery stage middle ear postoperative pocket group preoperative ventilation tube insertion cholesteatoma classification ossicular chain study postoperative abg retraction pockets hearing middle intervention disease children ossicular process signi preoperative abg erosion group borgstein signi ficant conduction erasmu ventilation ficant threshold chain retraction pocket promontory signi ficant difference air-bone erasmus atelectasis classification otitis media 0.0 pars tensa difference incidence result non-erosion group bone conduction thresholds evidence tensa system fi xation fi ndings damage non-erosion classification system disease process classi stape article erasmus classi fication preoperative air-bone gap postoperatively classi fication air conduction tragal cartilage fication hospital stage v safety otorhinolaryngol treatment media analysis editor otiti