[1] Univ Med Ctr Utrecht, Dept Psychiat, Brain Ctr Rudolf Magnus, Utrecht, Netherlands
[2] Maastricht Univ, Med Ctr, Dept Psychiat & Psychol, Maastricht, Netherlands
[3] Kings Coll London, Inst Psychiat, Dept Psychosis Studies, London, England
[4] Psychiat Rivierenland, Tiel, Netherlands