title: Evidence needed for treatment strategies in refractory depression.
authors.forename: N
authors.initials: N
authors.lastname: Agrawal
mesh_terms: D003866:Depressive Disorder / Q000628:therapy*; D004599:Electric Stimulation Therapy / Q000379:methods*; D006801:Humans; D014630:Vagus Nerve / Q000502:physiology*