If you're an NFL player, it may be the most important piece of paper you can sign before opening day.
Just ask Kenechi Udeze.
In winter 2008, Udeze, a defensive end for the Minnesota Vikings, started feeling intense migraines. He'd had headaches before, but nothing like these. A trip to a Minnesota hospital the day after the New York Giants beat the New England Patriots in Super Bowl XLIII revealed the reason.
Cancer was raging through his blood ...
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