The first 47 participants (20 uAR, 11uIR, 16 iCL/P) were scanned using a 3.0 Tesla Siemens Trio MR scanner. Halfway through recruitment, the scanner was replaced with a 3.0 Tesla GE Premier MRI Scanner. The final 32 participants completed scanning on this scanner. Both scanners used a 12-channel head coil. The COMBAT harmonization method was applied to adjust for scanner-induced variation.43 (link),44 (link)