Tampa, Fla. (November 8, 2007) – Estimates are that up to 70 million people worldwide may be suffering from severe urinary incontinence. A major cause of urinary incontinence is a deficiency of the urethral sphincter muscle, often associated with trauma during child birth, resulting from prostate surgery, or due to aging. According to a new study, those suffering from urethral sphincter muscle deficiency and resulting incontinence may eventually find relief through muscle cell transplants.