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Schultze-Lutter, Frauke; Ruhrmann, Stephan; Berning, Julia; Maier, Wolfgang; Klosterkötter, Joachim (2010). Basic symptoms and ultrahigh risk criteria: symptom development in the initial prodromal state. Schizophrenia bulletin, 36(1), pp. 182-91. Oxford: Oxford University Press 10.1093/schbul/sbn072
