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Ricardo Valerdi has advised many UA student-athletes, including former football player Jason Sweet. Valerdi and Sweet worked together on an app that educates football players about concussion.  (Photo: Emily Litvack/UA Office for Research, Discovery & Innovation) Ricardo Valerdi has advised many UA student-athletes, including former football player Jason Sweet. Valerdi and Sweet worked together on an app that educates football players about concussion.