title: Ear-canal compared to mastoid electrode placement in BRA.
mesh_terms: D001299:Audiometry / Q000379:methods*; D001300:Audiometry, Evoked Response / Q000295:instrumentation / Q000379:methods*; D001933:Brain Stem / Q000502:physiology; D004424:Ear Canal; D004566:Electrodes; D006801:Humans; D008416:Mastoid