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Scaled models used during neuronavigation. a Original size (B100), half-sized (B50) and quarter-sized (B25) models. b Frontal and back view of anatomical landmarks used for navigation and measurements: 1. right ear, 2. nasion, 3. right inferior frontal cortex, 4. right parietal cortex, 5. left parietal cortex, 6. right occipital cortex, 7. left occipital cortex, 8. left inferior frontal cortex, 9. left ear
