Intended for healthcare professionals

Letters Cannabis use and psychosis

Authors’ reply

BMJ 2011; 342 doi: (Published 18 April 2011) Cite this as: BMJ 2011;342:d1973
  1. Rebecca Kuepper, research psychologist,
  2. Jim van Os, professor,
  3. Cecile Henquet, lecturer
  1. 1Department of Psychiatry and Neuropsychology, South Limburg Mental Health Research and Teaching Network, EURON, Maastricht University Medical Centre, Maastricht, Netherlands
  1. r.kuepper{at}
  • Competing interests: None declared.

Diagnoses of psychotic disorder in the Diagnostic and Statistical Manual of Mental Disorders and International Classification of Diseases have poor validity and reliability, particularly in the context of general population studies, which is why the EDSP study focused on the full range …

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