AA	aortic arch
BCT	brachiocephalic trunk
C3_TF Entrance_LVA_AA	AA-originated LVA entering the TF at C3
C4_TF Entrance_LVA_SA	SA-originated LVA entering the TF at C4
C7_TF Entrance_LVA_AA	AA-originated LVA entering the TF at C7
CI	confidence interval
LSA/RSA	left/right SA
LVA/RVA	left/right VA
LVA_AA	AA-originated LVA
LVA_SA	SA-originated LVA
RCCA	right common carotid artery
RVA_AA	AA-originated RVA
RVA_BCT	BCT-originated RVA
RVA_RCCA	RCCA-originated RVA
RVA_SA	SA_originated RVA
SA	subclavian artery
TF	transverse foramen
VA	vertebral artery