Dr. Julio Frenk, Dean of the Faculty at the Harvard School of Public Health, speaks as NFL football commissioner Roger Goodell listens, at left, in Boston, Thursday, Nov. 15, 2012. Good

 

              Dr. Julio Frenk, Dean of the Faculty at the Harvard School of Public Health, speaks as NFL football commissioner Roger Goodell listens, at left, in Boston, Thursday, Nov. 15, 2012. Good
Dr. Julio Frenk, Dean of the Faculty at the Harvard School of Public Health, speaks as NFL football commissioner Roger Goodell listens, at left, in Boston, Thursday, Nov. 15, 2012. Goodell delivered the Dean’s Distinguished Lecture where he discussed some of the rules that have been created to limit concussions in the game of football. Goodell said the league will do what it needs to do to protect the safety of its 1,800 players. (AP Photo/Elise Amendola)