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Antirheumatic Agents
Tumor Necrosis Factor-alpha
Rheumatoid Factor
Rheumatoid Arthritis
Arthritis
Osteoporosis
Severity of Illness Index
Registries
Cohort Studies
Prospective Studies
Bone Density
Risk Factors
Treatment Outcome
Age Factors
Sex Factors
Great Britain
England
Epidemiologic Methods
Questionnaires
Disease Progression
Co-Publications
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