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Finnish case–control and family studies support PTPN22 R620W polymorphism as a risk factor in rheumatoid arthritis, but suggest only minimal or no effect in juvenile idiopathic arthritis

Rheumatoid DisorderRheumatologyEpidemiologyFinnish Case–controlAutoimmune DiseaseRheumatic DiseasesJuvenile Idiopathic ArthritisGenetic EpidemiologyAutoimmunityInflammatory Rheumatic DiseasePublic HealthMedicineImmune-related Gene PolymorphismRheumatoid ArthritisSystemic Juvenile Idiopathic Arthritis