NASCAR Vickers Blood Clots Auto Racing

Brian Vickers, right, talks about his medical issues as Dr. Steven A. Limentani, left, looks on during a news conference during practice for the NASCAR Sprint All-Star auto race in Charlotte, N.C., Friday, May 21, 2010. Vickers says he will miss the remainder of the NASCAR season because of blood clots in his lungs and left leg. (AP Photo/Chuck Burton)