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Ryan Zimmerman retires
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Nationals to retire Ryan Zimmerman's number
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Latest CTE findings just another blow to NFL's dubious history with head injuries – New York Daily News
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Nationals announce they are retiring No. 11 for Ryan Zimmerman
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Nationals to retire Ryan Zimmerman's number
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Washington Nationals retire No. 11 for Ryan Zimmerman - Federal Baseball
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Ryan Zimmerman Says Physical Toll Was Biggest Factor in Retirement Decision – NBC4 Washington
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Washington Nationals retire No. 11 for Ryan Zimmerman - Federal Baseball
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Frontiers Chronic Pain in the Elderly: Mechanisms and Perspectives