Additional Study Information: Sertraline (also known as Zoloft) is an FDA approved medication that is used to treat anxiety in children and adolescents. We aim to better understand how children and adolescents with anxiety respond to sertraline and whether we can predict medication response. If your child is eligible, he or she can participate in a research study and will receive both a clinical evaluation and 14 weeks of medication at no cost to you. Your child may also have access to a therapeutic school on the premises.