What causes schizophrenia?
D015331:Cohort Studies; D003718:Denmark / Q000453:epidemiology; D004781:Environmental Exposure; D020022:Genetic Predisposition to Disease; D006801:Humans; D007239:Infections; D012307:Risk Factors; D012559:Schizophrenia / Q000453:epidemiology / Q000209:etiology* / Q000235:genetics; D012621:Seasons; D014505:Urban Population