All subjects other than HC were outpatients who attended either the NCNP hospital or local
hospitals/clinics. All subjects were interviewed by a trained psychiatrist using the Japanese
version of theMini-International Neuropsychiatric Interview [19,20], and diagnoses were confirmed
based on the DSMofMental Disorders, 4th ed., text rev. (DSM-IV-TR) [21]. Schizophrenic
symptoms were corroborated by administering the Positive and Negative Symptoms
Scale (PANSS) to all subjects with SZ [22]