Antidepressant efficacy and safety of low-dose Sertraline and Standard-Dose imipramine for the treatment of depression in older adults: results from a double-blind, randomized, controlled clinical trial - Forlenza, Orestes V.; Almeida, Osvaldo Pereira; Stoppe Jr., Alberto; Hirata, Edson S.; Ferreira, Rita C. R. (International Psychogeriatrics, 2001)