Randomised controlled trial to improve health and reduce substance use in established psychosis (IMPaCT): cost-effectiveness of integrated psychosocial health promotion oleh Margaret Heslin, Anita Patel, Daniel Stahl, Poonam Gardner-Sood, Manyara Mushore, Shubulade Smith, Kathryn Greenwood, Oluwadamilola Onagbesan, Conan O’Brien, Catherine Fung, Ruth Ohlsen, David Hopkins, Philippa Lowe, Maurice Arbuthnot, Stan Mutatsa, Gill Todd, Anna Kolliakou, John Lally, Brendon Stubbs, Khalida Ismail, Anthony David, Robin Murray, Zerrin Atakan, Fiona Gaughran