2.2 MRI acquisition
All subjects were scanned on a GE Sigma 3.0 T MR (GE Medical Systems, Milwaukee, Wisconsin) with T1-Weighted 3D magnetization with the following parameters: time to repetition (TR) = 7.8 ms; time to echo (TE) = 3.0 ms; flip angle = 7°; matrix = 256×256; voxel size = 1×1×1 mm3. Each scan was supervised by a trained technologist.