[1] Univ Athens, Eginit Hosp, Dept Psychiat 1, Vas Sofias Ave 72-74, Athens 11528, Greece
[2] Univ Athens, Attikon Gen Hosp, Dept Psychiat 2, Athens, Greece
[3] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Psychosis Studies, Sect Cognit Neuropsychiat, London WC2R 2LS, England