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Information from A. Caspi, T. E. Moffitt, M. Cannon, J. McClay, R. Murray, et al. (2005). Moderation of the effect of adolescent-onset cannabis use on adult psychosis by a functional polymorphism in the catechol-O-methyltransferase gene: Longitudinal evidence of a gene X environment interaction. Biological Psychiatry, 57, 1117–1122.