<qa>  How many victims of serious motor vehicle collisions will be recruited from a community hospital emergency roomForty victims of serious motor vehicle collision MVC with ASD will be recruited from a community hospital emergency room and evaluated with clinical assessments, and standardized questionnaires within 2 weeks after the MVC. The subjects will then be randomized to either sertraline or placebo for 8 weeks duration. Psychometric testing and psychological evaluations will be conducted at 4, 10 weeks post-MVC, and after a 2-week taper of the medication and 2 more weeks 14 weeks post-MVC. 