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Dragt, S; Nieman, D H; Schultze-Lutter, F; van der Meer, F; Becker, H; de Haan, L; Dingemans, P M; Birchwood, M; Patterson, P; Salokangas, R K R; Heinimaa, M; Heinz, A; Juckel, G; Graf von Reventlow, H; French, P; Stevens, H; Ruhrmann, S; Klosterkötter, J; Linszen, D H and EPOS group, (2012). Cannabis use and age at onset of symptoms in subjects at clinical high risk for psychosis. Acta psychiatrica Scandinavica, 125(1), pp. 45-53. Oxford: Wiley-Blackwell 10.1111/j.1600-0447.2011.01763.x
