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A Case-Control Study of the Effectiveness of Bicycle Safety Helmets in Preventing Facial Injury DIANE C. THOMPSON, MS, ROBERT S. THOMPSON, MD, FREDERICK P. RivARA, MD, MPH, AND
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A Case-Control Study of the Effectiveness of Bicycle Safety Helmets in Preventing Facial Injury DIANE C. THOMPSON, MS, ROBERT S. THOMPSON, MD, FREDERICK P. RivARA, MD, MPH, AND