1. International League of Associations for Rheumatology classification of juvenile idiopathic arthritis: second revision, Edmonton 2001;Petty;J. Rheumatol.,2004
2. Population studies of the Rheumatic Diseases;Bennett,1968
3. Criteria of the classification of spondylarthropathies;Amor;Rev. Rhum. Mal. Osteoartic.,1990
4. The European Spondylarthropathy Study Group preliminary criteria for the classification of spondylarthropathy,;Dougados;Arthritis Rheum.,1991
5. Seronegative polyarthritis;Wright,1976