1. The American Rheumatism Association 1987 revised criteria for the classification of rheumatoid arthritis;Arnett;Arthritis Rheum,1988
2. The no man's land of undifferentiated inflammatory polyarthritis;Paget;J Rheumatol,2004
3. Cases of early inflammatory polyarthritis should not be classified as having rheumatoid arthritis;Symmons;J Rheumatol,2003
4. The performance of the 1987 ARA classification criteria for rheumatoid arthritis in a population-based cohort of patients with early inflammatory polyarthritis;Harrison;J Rheumatol,1998
5. The Leiden Early Arthritis Clinic;Van Aiken;Clin Exp Rheumatol,2003