24-year-old NFL player retires over head trauma fears

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San Francisco 49ers linebacker Chris Borland retired from the NFL after only one season due to concerns over the potential long-term effects of head trauma.http://feeds.feedburner.com/~ff/rss/cnn_us?d=yIl2AUoC8zA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=qKP7rYRZHEM:dj4Cli3EMPY:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/rss/cnn_us?d=7Q72WNTAKBA</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=qKP7rYRZHEM:dj4Cli3EMPY:7Q72WNTAKBA) http://feeds.feedburner.com/~ff/rss/cnn_us?i=qKP7rYRZHEM:dj4Cli3EMPY:V_sGLiPBpWU</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=qKP7rYRZHEM:dj4Cli3EMPY:V_sGLiPBpWU) http://feeds.feedburner.com/~ff/rss/cnn_us?d=qj6IDK7rITs</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=qKP7rYRZHEM:dj4Cli3EMPY:qj6IDK7rITs) http://feeds.feedburner.com/~ff/rss/cnn_us?i=qKP7rYRZHEM:dj4Cli3EMPY:gIN9vFwOqvQ</img> (http://rss.cnn.com/~ff/rss/cnn_us?a=qKP7rYRZHEM:dj4Cli3EMPY:gIN9vFwOqvQ)
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