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United States
Massachusetts
Boston
Diagnosis-Related Groups
Medicare
Severity of Illness Index
Logistic Models
Hospital Mortality
Retrospective Studies
Cohort Studies
Comorbidity
Models, Statistical
Risk Adjustment
United States Department of Veterans Affairs
Outcome Assessment (Health Care)
Physician's Practice Patterns
Questionnaires
Health Services Research
Hospitalization
Nursing Homes
Co-Publications
33
29
25
23
16
14
11
10
8
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