No abstract available
MeSH terms
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Aged
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Brain Ischemia / diagnostic imaging*
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Brain Ischemia / etiology*
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Cerebral Angiography
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Female
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Humans
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Male
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Middle Aged
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Neck / diagnostic imaging*
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Rotation / adverse effects*
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Ultrasonography, Doppler, Color*
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Ultrasonography, Doppler, Transcranial*
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Vertebrobasilar Insufficiency / diagnostic imaging*
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Vertebrobasilar Insufficiency / etiology*