A double-blind, placebo-controlled treatment trial of citalopram for major depressive disorder in older patients with heart failure: the relevance of the placebo effect and psychological symptoms - Fraguas Junior, Renerio; Telles, Renata Martinho da Silva; Alves, Tânia Correa Toledo Ferraz; Andrei, Anna Maria; Rays, Jairo; Iosifescu, Dan V; Wajngarten, Mauricio (Contemporary Clinical Trials, 2009)