(HealthDay News) -- Here are the latest clinical trials, courtesy of CenterWatch:

Pneumonia

If you are 70 or older, have received a pneumonia vaccine at least five years ago and are in good general health, you may qualify for this study.

The research site is in Raleigh, N.C.

More information

Please see http://www.centerwatch.com/patient/studies/cat167.html.

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Strokes

If you are 21 or older and meet other eligibility requirements, you may qualify for this study.

The research site is in Lexington, Ky.

More information

Please see http://www.centerwatch.com/patient/studies/cat142.html.

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Parkinson's Disease

If you have a diagnosis of orthostatic hypotension associated with: Parkinson's disease, multiple system atrophy, pure autonomic failure, dopamine beta hydroxylase deficiency, or non-diabetic autonomic neuropathy -- and have a documented fall in blood pressure within three minutes of standing -- you may qualify for this study.

The research site is in Nashville, Tenn.

More information

Please see http://www.centerwatch.com/patient/studies/cat117.html.

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