INS and metabolic syndrome X: ("Schizophrenia"[MeSH Terms] OR "Schizophrenia"[All Fields]) AND ("Metabolic Syndrome"[MeSH Terms] OR "Metabolic Syndrome X"[All Fields] OR "Metabolic Syndrome"[All Fields] OR "Insulin Resistance"[All Fields] OR "Obesity"[All Fields] OR "Dyslipidemias"[All Fields]) AND ("Cognition Disorders"[MeSH Terms] OR "Cognitive Dysfunction"[All Fields] OR "Cognitive Impairment"[All Fields] OR "Neuropsychological Tests"[All Fields])