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Prospective Studies
Risk Factors
Cohort Studies
Treatment Outcome
Severity of Illness Index
Logistic Models
Atrial Fibrillation
Pneumonia
Community-Acquired Infections
Stroke
Sciatica
Thromboembolism
Spinal Stenosis
Warfarin
Anticoagulants
Boston
United States
Hospitalization
Questionnaires
Outcome Assessment (Health Care)
Co-Publications
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