No abstract available
MeSH terms
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Cerebrovascular Circulation*
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Chronic Disease
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Disease Susceptibility / diagnostic imaging
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Disease Susceptibility / etiology
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Humans
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Multiple Sclerosis / diagnostic imaging*
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Multiple Sclerosis / etiology
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Spinal Cord / blood supply*
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Ultrasonography, Doppler, Color
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Venous Insufficiency / complications
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Venous Insufficiency / diagnostic imaging*