Steelers to sit safety Clark at Denver

Safety Ryan Clark won't play in Denver for the fourth time since 2007 because of a sickle-cell trait that exposes him to health risks at higher altitudes.

Source: http://ChicagoTribune.feedsportal.com/c/34253/f/622872/s/2310a05a/l/0L0Schicagotribune0N0Csports0Cbreaking0Cchi0Esteelers0Eto0Esit0Esafety0Eclark0Eat0Edenver0E20A120A90A40H0A0H78548860Bstory0Dtrack0Frss/story01.htm

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