Psychiatric disorders in adolescents are an important social problem which is relevant to almost all healthcare professionals. According to the results of The National Comorbidity Survey-Adolescent Supplement (NCS-A), the lifetime prevalence of anxiety, behavior, mood, and substance use disorders among adolescents was 31.9%, 19.1%, 14.3%, and 11.4%, respectively. Approximately 40% of participants in this survey with one class of disorder also met criteria for another class of lifetime disorder. Comorbidity is increasingly recognized as a key feature of mental disorders among adolescents....