No abstract available
MeSH terms
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Aged
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Angiography
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Basilar Artery / diagnostic imaging*
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Carotid Arteries / diagnostic imaging
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Circle of Willis / abnormalities
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Collateral Circulation
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Female
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Humans
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Longevity
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Male
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Middle Aged
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Subclavian Artery / diagnostic imaging
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Thrombosis / diagnostic imaging*
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Vascular Diseases / diagnostic imaging
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Vertebral Artery / diagnostic imaging