Article Photos: Ex-players call NFL brain-injury panel a 'sham' 1/12

FILE - This combo image shows NFL Players' lawyer David Frederick, left, in a November 2008 file photo, and NFL lawyer Paul Clement in a June 2011 file photo. With perhaps billions of dollars stake, a hearing Tuesday, April 8, 2013 over concussion litigation filed against the NFL promises to be a brawl between the legal heavyweights. (AP Photo/File)