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The validity of the 16-item version of the Prodromal Questionnaire (PQ-16) to screen for ultra high risk of developing psychosis in the general help-seeking population.
Ising HK, Veling W, Loewy RL, Rietveld MW, Rietdijk J, Dragt S, Klaassen RM, Nieman DH, Wunderink L, Linszen DH, van der Gaag M. Ising HK, et al. Among authors: rietveld mw. Schizophr Bull. 2012 Nov;38(6):1288-96. doi: 10.1093/schbul/sbs068. Epub 2012 Apr 19. Schizophr Bull. 2012. PMID: 22516147 Free PMC article.