TY  - GEN
AU  - Kelley,M E
AU  - van Kammen,D P
AU  - Allen,D N
TI  - Empirical validation of primary negative symptoms: independence from effects of medication and psychosis
SN  - 0002-953X
PY  - 1999///0323
KW  - Adult
KW  - Age of Onset
KW  - Antipsychotic Agents
KW  - adverse effects
KW  - Anxiety Disorders
KW  - diagnosis
KW  - Basal Ganglia Diseases
KW  - chemically induced
KW  - Depressive Disorder
KW  - Factor Analysis, Statistical
KW  - Haloperidol
KW  - Humans
KW  - Longitudinal Studies
KW  - Male
KW  - Middle Aged
KW  - Motivation
KW  - Psychiatric Status Rating Scales
KW  - statistics & numerical data
KW  - Psychometrics
KW  - Schizophrenia
KW  - Schizophrenic Psychology
N1  - Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S
UR  - https://doi.org/10.1176/ajp.156.3.406
ER  -