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>> what is he doing? >> i had depression problems. i had short-term memory that was terrible for a year and a half. i kept sleepwalking for three and a half years and needed medication. i had headaches for five. that's when i decided maybe there was something wrong with my brain. >> joining me tonight, chris liwienski, co-director of the center for study of cte at boston university and author of "head games: football's concussion crisis." chris, great to have you with us tonight on the program. how many athletes in all contact sports do you think are suffering from cte? >> oh, we can't actuall...

>> i had depression problems. i had short-term memory that was terrible for a year and a half. i kept sleepwalking for three and a half years and needed medication. i had headaches for five. that's when i decided maybe there was something wrong with my brain. >> joining me tonight, chris nowinski, co-director of the center for study of cte at boston university and author of "head games: football's concussion crisis." chris, great to have you with us tonight on the program. how many athletes in all contact sports do you think are suffering from cte? >> oh, we can't actually diagnosis the diseas...