Postmenopausal therapy with estrogen may increase the risk of Parkinson's disease among women who have had a hysterectomy, according to new findings. Hormone replacement therapy in women with natural menopause, however, does not increase the risk.

In a case-control study, Dr. Rita A. Popat, of Stanford University School of Medicine, California, and colleagues examined the associations of reproductive factors and postmenopausal hormone use with the risk of Parkinson's disease among postmenopausal women.

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