DK54: a reduced version of the Desikan-Killiany parcellation

This is a reduced version of the Desikan-Killiany parcellation: https://surfer.nmr.mgh.harvard.edu/fswiki/CorticalParcellation. We reduced from 68 parcels to 54. Note, this is a volumetric parcellation. Parcels were merged based on the procedure proposed in Tait, Luke, et al. "A systematic evaluation of source reconstruction of resting MEG of the human brain with a new high‐resolution atlas: Performance, precision, and parcellation." Human Brain Mapping 42.14 (2021): 4685-4707.