Concussions vary from person to person, event to event.
PBS keeps a running tally of diagnosed concussions in the NFL. The Chargers are the only team with five. One team, the Browns, has four. Five teams have three. Nine have none.
Dr. Vernon Williams, neurologist and director of the Kerlan-Jobe Center for Sports Neurology and Pain Medicine in Los Angeles discusses the issues of concussions.
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