No abstract available
Publication types
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Letter
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Research Support, Non-U.S. Gov't
MeSH terms
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Aged
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Aged, 80 and over
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Diagnosis, Differential
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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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Parkinson Disease / diagnostic imaging*
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Parkinson Disease, Secondary / chemically induced*
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Parkinson Disease, Secondary / diagnosis
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Parkinson Disease, Secondary / diagnostic imaging*
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Reproducibility of Results
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Substantia Nigra / diagnostic imaging
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Ultrasonography, Doppler, Transcranial / methods*