Brief cognitive–behavioural therapy for patients in the community with schizophrenia: Randomised controlled trial in Beijing, China – RETRACTION. (21st May 2019) - Guo, Zhi-Hua; Li, Zhan-Jiang; Ma, Yun; Sun, Jing; Guo, Jun-Hua; Li, Wen-Xiu; Wang, Zhi-Qiang; Xu, Hui-Li; Ng, Roger M. K.; Turkington, Douglas; Kingdon, David