Morrison, Anthony P, Hutton, Paul, Wardle, Melissa, Spencer, Helen, Barratt, Sarah, Brabban, Alison, Callcott, Pauline, Christodoulides, Thomas, Dudley, Robert, French, Paul, Lumley, Victoria, Tai, Sara J, Turkington, Douglas, "Cognitive therapy for people with a schizophrenia spectrum diagnosis not taking antipsychotic medication: an exploratory trial", Psychological Medicine, 2012