title: Negative symptoms of schizophrenia: the need for conceptual clarity.
authors.forename: R
authors.initials: R
authors.lastname: Tandon
authors.forename: J F
authors.initials: JF
authors.lastname: Greden
mesh_terms: D006801:Humans; D011569:Psychiatric Status Rating Scales; D012559:Schizophrenia / Q000145:classification / Q000175:diagnosis*; D012565:Schizophrenic Psychology