A 1-year, double-blind, placebo-controlled trial of ziprasidone 40, 80 and 160 mg / day in chronic schizophrenia: the Ziprasidone Extended Use in Schizophrenia (ZEUS) study. - Arato, M; O’Connor, R; Meltzer, H Y; ZEUS Study Group (Int Clin Psychopharmacol, 2002)