De-identified blood samples will be collected from study subjects at Screening (Visit 1) according to the standard Molecular Profiling supplement to the protocol. Participation in this component is optional for study subjects. Samples may be utilized in the future to investigate GAD (generalized anxiety disorder) genetics, expression metabonomic and protein biomarker profiles, drug-response, or other genetic or biomarker questions. [Metabonomics: The study of metabolic responses to drugs, environmental changes and diseases. Metabonomics is an extension of genomics (concerned with DNA) and proteomics (concerned with proteins). ]