@article{KlingbergWittorfMeisneretal.2011,
  author    = {Stefan Klingberg and Andreas Wittorf and Christoph Meisner and Wolfgang W{\"o}lwer and Georg Wiedemann and Jutta Herrlich and Andreas Bechdolf and Bernhard W. M{\"u}ller and Gudrun Sartory and Michael Wagner and Tilo Kircher and Hans-Helmut K{\"o}nig and Corinna Engel and Gerhard Buchkremer},
  title     = {Cognitive behavioural therapy versus supportive therapy for persistent positive symptoms in psychotic disorders: the POSITIVE Study, a multicenter, prospective, single-blind, randomised controlled clinical trial},
  journal   = {Trials},
  volume    = {11},
  number    = {123},
  doi       = {10.1186/1745-6215-11-123},
  year      = {2011},
}