1. Petty, R. E. et al. International League of Associations for Rheumatology classification of juvenile idiopathic arthritis: second revision, Edmonton, 2001. J. Rheumatol. 31, 390–392 (2004).
2. Manners, P., Lesslie, J., Speldewinde, D. & Tunbridge, D. Classification of juvenile idiopathic arthritis: should family history be included in the criteria? J. Rheumatol. 30, 1857–1863 (2003).
3. Tsitsami, E. et al. Positive family history of psoriasis does not affect the clinical expression and course of juvenile idiopathic arthritis patients with oligoarthritis. Arthritis Rheum. 49, 488–493 (2003).
4. Berntson, L. et al. HLA-B27 predicts a more extended disease with increasing age at onset in boys with juvenile idiopathic arthritis. J. Rheumatol. 35, 2055–2061 (2008).
5. Stoll, M., Lio, P., Sundel, R. & Nigrovic, P. Comparison of Vancouver and International League of Associations for rheumatology classification criteria for juvenile psoriatic arthritis. Arthritis Rheum. 59, 51–58 (2008).