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The 4 insertion points of the acupuncture needles and the sites of the 16-channel (Ch) near-infrared spectroscopy probes (Chs 1–16. The insertion points corresponded to the supraorbital and supratrochlear nerves of the CN V1, and the emission and detection probes were placed on the frontal pole region according to the international 10–20 system. Color images are available online.
