- Participants who are previously or currently diagnosed with the following mental disorders by DSM-IV: organic mental disorder, schizophrenia (psychiatric disorder with symptoms of emotional instability, detachment from reality, often with delusions and hallucinations, and withdrawal into the self), schizoaffective disorder, delusional disorder, undifferentiated mental disorders and bipolar affective disorder, participants with history of drug abuse, including alcohol and drug abuse in the past 12 months