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

Premature Ejaculation

If you are male, 18 or older, and in a relationship with one female partner who also is willing to participate, you may qualify for this study.

The research site is in Murray, Utah.

More information

Please see http://www.centerwatch.com/patient/studies/cat123.html.

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Bipolar Disorders

If you have bipolar disorder, you may be eligible for this study.

The research site is in Washington, D.C.

More information

Please see http://www.centerwatch.com/patient/studies/cat20.html.

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Knee Injuries

If you have osteoarthritis of the knee, and currently take a prescription or over-the-counter oral pain medication, you may qualify for this study.

The research site is in Atlanta, Ga.

More information

Please see http://www.centerwatch.com/patient/studies/cat428.html.

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