TY  - BOOK
AU  - Kahn,Katherine L.
ED  - Research and Development Corporation, 
ED  - Department of Health and Human Services. [ U.S] ,
TI  - The effect of comorbidity on appropriateness ratings for two gastrointestinal procedures
T2  - A Rand note
PY  - 1991///
CY  - California
PB  - Rand Corporation
KW  - Gallbladder
KW  - Surgery
KW  - Cholecystectomy
KW  - Utilization.
KW  - Medical care
N1  - Includes bibliographical references
ER  -