All structural images were collected using a 3T Philips Achieva Scanner (Philips Medical System, Best, Netherlands) at Ochang campus of Korean Basic Science Institute. All subjects were scanned with the same 32-channel head coil at the same pulse sequence. MRI T1 parameters were referenced from the Alzheimer's Disease Neuroimaging Initiative (ADNI) protocol (TR = 6.8 ms, TE = 3.1 ms, field of view = 256 mm, flip angle = 9°, voxel size = 1 × 1 × 1.2 mm, 170 slices without gaps).
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