Toomey R, Kremen WS, Simpson JC, Samson JA, Seidman LJ, Lyons MJ, Faraone SV, Tsuang MT.
Revisiting the factor structure for positive and negative symptoms: evidence from a large heterogeneous group of psychiatric patients.
Am J Psychiatry
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1997 Mar 1
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154(3):371-7.
PubMed
Abstract