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 Clinical characteristics of the patients and controls
Patient Control
No. of cases (sides) 29(31) 15
Mean age, y 64.4±9.9 68.6±8.7
Sex, M/F 23/6 9/6
Clinical diagnosis 
 ICA/MCA occlusive disease 26(28) 
 Unclippable cerebral  aneurysm 3(3) 
Note.—ICA indicates internal carotid artery; MCA, middle cerebral artery.
	Patient	Control
No. of cases (sides)	29(31)	15
Mean age, y	64.4±9.9	68.6±8.7
Sex, M/F	23/6	9/6
Clinical diagnosis
ICA/MCA occlusive disease	26(28)
Unclippable cerebral aneurysm	3(3)