Efficacy and tolerability of olanzapine in elderly patients with psychotic disorders: a prospective study. - Madhusoodanan,S.; Brenner,R.; Suresh,P.; Concepcion,N.M.; Florita,C.D.; Menon,G.; Kaur,A.; Nunez,G.; Reddy,H. (Ann Clin Psychiatry, 2000)