Assertion: subclavian artery's origin | /r/HasProperty | incidence
Facets:
Source sentences:
text: variable origin single left aberrant origin (86%), single right aberrant (12%), bilateral aberrant origin (3%) 8 aortic arch origin of left vertebral artery: incidence ~5% (range 3.1-8.3%) second (not first) branch of subclavian artery external carotid artery (rare) 8, 9 - see case 14 common carotid artery (rare) 9 - see case 15 internal carotid artery (rare) 9