title: Placebo group needed for interpretation of combination trial.
authors.forename: Rif S
authors.initials: RS
authors.lastname: El-Mallakh
authors.forename: Gagandeep
authors.initials: G
authors.lastname: Kaur
authors.forename: Steven
authors.initials: S
authors.lastname: Lippman
mesh_terms: D000928:Antidepressive Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D035061:Control Groups; D003865:Major Depressive Disorder / Q000188:drug therapy*; D004359:Drug Therapy, Combination; D006801:Humans; D010919:Placebos / Q000008:administration & dosage*; D016032:Randomized Controlled Trials as Topic / Q000379:methods* / Q000592:standards / Q000706:statistics & numerical data; D012107:Research Design / Q000592:standards*
chemical_list: D000928:Antidepressive Agents; D010919:Placebos