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Fall off your bike and get hurt? You\'re not alone. About half a million U.S. bicyclists visit ERs due to injuries every year. President George W. Bush fell off his mountain bike and down a hill in May 2004. Credit: AP Photo/Charles Dharapak

Fall off your bike and get hurt? You're not alone. About half a million U.S. bicyclists visit ERs due to injuries every year. President George W. Bush fell off his mountain bike and down a hill in May 2004. Credit: AP Photo/Charles Dharapak

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