Seuraavanlainen tutkimus: Robert F. Ferdinanda, Jan van der Endea, Ilja Bongersa, Jean-Paul Seltenb, Anja Huizinka, and Frank C. Verhulsta (2005), Cannabis — psychosis pathway independent of other types of psychopathology. Schizophrenia Research, Volume 79, Issues 2-3, Pages 289-295.
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