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Cannabis use predicts future psychotic symptoms, and vice versa

Addiction. 2005 May;100(5):612-8.
Ferdinand RF, Sondeijker F, van der Ende J, Selten JP, Huizink A, Verhulst FC.

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Letter to editor: Cannabis-related psychosis and the gene-environment interaction. Comments on Ferdinand et al. 2005 by Van Os et al in Addiction Volume 100 Issue 6 Page 874 - June 2005