dr. mulfese and dr. shenton and it dovetails into what the gentleman from mississippi was talking about. are the symptoms of a concussion or tbi uniform enough so that it's possible for early detection or developing a checklist for a coach or a parent to be used, you know, but nonmedical? we'll start with you. >> no. >> well, that was easy. >> the symptoms overlap with depression and ptsd and that's been a problem. in fact there was a paper published in the new england journal of medicine that said when you remove the effects of depression and the effects of ptsd, mild tbi doesn't exist. that's a real disservice. it used to be people would claim that when people came in complaining that they still had symptoms from hitting their heads, since there was no evidence from conventional mri or ct, they said go see a psychiatrist. so it was really not appropriate at all because there's at least a small minority of people who have mild concussion who go on to have symptoms, and they can go on for months, for yea