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Stewart, Walter F., Namhee Kim, Chloe S. Ifrah, Richard B. Lipton, Tamar A. Bachrach, Molly E. Zimmerman, Mimi Kim, و Michael L. Lipton. "Symptoms From Repeated Intentional and Unintentional Head Impact in Soccer Players." Neurology 2017.

Stewart, Walter F., et al. "Symptoms From Repeated Intentional and Unintentional Head Impact in Soccer Players." Neurology 2017.