MZ	monozygotic
DZ	dizygotic
OCD	obsessive–compulsive disorder
ADHD	attention-deficit/hyperactivity disorder
MRI	magnetic resonance imaging
T1W	T1-weighted
WMH	white matter hyperintensity
BMI	Body Mass Index
ICD	Implantable Cardioverter Defibrillator
DICOM	Digital Imaging and Communications in Medicine
NIFTI	Neuroimaging Informatics Technology Initiative
SD	standard deviation
IQR	interquartile range
ACE	Additive, Common, and Unique Environmental model
rMZ	Correlation coefficient for monozygotic twins
rDZ	Correlation coefficient for dizygotic twins
MNI	Montreal Neurological Institute