Using a sheath-based deployment system4, the electrode arrays can be advanced or retreated in reference to three white markers of the electrode array and their relationship with the round window, facilitating a finely tuned insertion technique: conventional insertion (first white marker) (Fig. 1a), over insertion (up to third white marker) (Fig. 1b), and pull-back maneuver assisted insertion (first white marker) (Fig. 1c). The insertion technique was decided entirely in chronological order. The conventional insertion refers to the initial insertion of the electrode array up to the first white marker as outlined by the product manual (Cochlear; Sydney, Australia). As for over-insertion, the electrode was inserted a little bit more deeply up to the third white marker, advancing past the first marker. As described by Riemann et al.25, the pull-back maneuver assisted insertion relies on pulling back until the first white marker of the electrode becomes visible again in the round window, following over-insertion.

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