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Colorectal Neoplasms
Barrett's Esophagus
Ulcerative Colitis
United States
United States Department of Veterans Affairs
Veterans
Colonoscopy
Mass Screening
Population Surveillance
Esophagoscopy
Restorative Proctocolectomy
Cost Benefit Analysis
Questionnaires
Logistic Models
Retrospective Studies
Risk Factors
Life Expectancy
Quality of Life
Health Status
Hospitals, Veterans
Co-Publications
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