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Apnea-hypopnea indices (means ± SD) for each of four feasibility trials of hypoglossal nerve stimulation therapy. Baseline, before initiating hypoglossal nerve stimulation (solid bars) and at 6 mo, 12 mo, or last follow-up after the initiation of stimulation (open bars) (Plotted from data provided in Refs. 4, 25, 38, 46).
