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All clinical records of schizophrenic patients included in the period 1979-1995 in the South Verona Psychiatric Case Register were reviewed and diagnoses operationally defined according to ICD-10 criteria using OPCRIT 3.1. Among the 335 scrutinized, 205 patients met the ICD-10 criteria for paranoid or undifferentiated schizophrenia. No seasonality of birth was found in these patients using a log-linear...
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