Functional magnetic resonance imaging of a parametric working memory task in schizophrenia: relationship with performance and effects of antipsychotic treatment. - Ettinger, Ulrich; Williams, Steven; Fannon, Dominic; Premkumar, Preethi; Kuipers, Elizabeth; Möller, Hans-Jürgen; Kumari, Veena (Psychopharmacology, 2011)