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P3, Tinnitus Handicap Inventory. The severe tinnitus ratings on the THI were reduced at 1 week, and at 1 month after the in-office series. White arrows suggest that the red/NIR photons reached sides of the neck with the LED-lined helmet (Protocol C). The NIR photons likely reached the left and right stellate ganglion areas, a target for NIR photons to reduce tinnitus [91]. THI, Tinnitus Handicap Inventory.
