Morrison, Anthony P, Turkington, Douglas, Pyle, Melissa, Spencer, Helen, Brabban, Alison, Dunn, Graham, Christodoulides, Tom, Dudley, Rob, Chapman, Nicola, Callcott, Pauline, Grace, Tim, Lumley, Victoria, Drage, Laura, Tully, Sarah, Irving, Kerry, Cummings, Anna, Byrne, Rory, Davies, Linda M, Hutton, Paul, "Cognitive therapy for people with schizophrenia spectrum disorders not taking antipsychotic drugs: a single-blind randomised controlled trial", Lancet, 2014