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The difference in acoustic stapes velocity due to the static loading of an AMEI on the RW (ΔHTV). Lines and shading show across-bone means and 95% CI, respectively. a 1-mm ball tip before drilling the RW niche. b 0.5-mm ball tip before drilling the RW niche. c 1-mm ball tip after drilling the RW niche. d 0.5-mm ball tip after drilling the RW niche.
