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