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Harrison, I., Joyce, E. M., Mutsatsa, S. , Hutton, S. B., Huddy, V., Kapasi, M. & Barnes, T. R. (2008). Naturalistic follow-up of co-morbid substance use in schizophrenia: the West London first-episode study. Psychological Medicine, 38(1), pp. 79-88. doi: 10.1017/S0033291707000797