Dr. Greg Zagaja prepares to perform a robotic prostatectomy on a patient at University of Chicago Medical Center using a da Vinci Si robotics system, Tuesday, Oct. 13, 2009 in Chicago. A study, appearing in Wednesday's Journal of the American Medical Association suggests the less-invasive keyhole surgery for prostate cancer may mean a higher risk for lasting incontinence and impotence when compared with traditional surgery. AP Photo logo AP Photo 28 months ago

Dr. Greg Zagaja prepares to perform a robotic prostatectomy on a patient at University of Chicago Medical Center using a da Vinci Si robotics system, Tuesday, Oct. 13, 2009 in Chicago. A study, appearing in Wednesday's Journal of the American Medical Association suggests the less-invasive keyhole surgery for prostate cancer may mean a higher risk for lasting incontinence and impotence when compared with traditional surgery.

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