Improvement of Schizophrenia Negative and Positive Symptoms With Memantine as Add-On Therapy to Clozapine: A Double-Blind, Randomized, Placebo-Controlled Trial

David de Lucena, Brisa Fernandes, Michael Berk, Seetal Dood, Dalton W Medeiros, Mariana Pedrini, Mauricio Kunz, Fabiano Gomes, Larriany Giglio, Maria Ines Lobato, Paulo Belmonte-de-Abreu, Clarissa S Gama