<qa>  What is the Affective Cluster score of Cicerone Post ConcussivePatients who receive sertraline will have significantly less post-concussive symptoms at 12 weeks than patients who received placebo. Post-concussive symptoms will be measured by the Gouvier Post-Concussive Syndrome Scale PCSC and the Affective Cluster score of the Cicerone Post Concussive Scale. 