the nfl, i'm sure, dr. cantu would say is... was pretty dismiss i have been about the research for a long time as well. it took a few more cases for the nfl to kind of come around and decide that this was a serious thing and needed serious attention. the nhl has not reached that point. i think question floating out there is how many more cases need to come forward before the nhl decides to take it a little bit more seriously. >> dr. cantu, what do you find and what is it that you think should be done to avoid more head trauma in sports. you do see more attention to it certainly in football these days. what do you think needs to be done generally? >> jeff, i agree completely with everything john just said in terms of the differences between the national football league who does get it and the national hockey league who, i hope, is on the way to getting it. it is interesting though that these three out of four that have all been enforcers and have had a robust fighting career, the first descriptions of chronic traumaticen self-op