title: Preface.
authors.forename: Konstantin V
authors.initials: KV
authors.lastname: Slavin
mesh_terms: D003865:Major Depressive Disorder / Q000175:diagnosis / Q000628:therapy; D004599:Electric Stimulation Therapy / Q000379:methods* / Q000639:trends*; D005767:Gastrointestinal Diseases / Q000175:diagnosis / Q000628:therapy; D006801:Humans; D059408:Pain Management / Q000379:methods / Q000639:trends