CD40LG and juvenile idiopathic arthritis: We also measured IgM anti-H31–19K9me in JIA patients and other RD patients, including juvenile ankylosing spondylitis, Henoch-Schonlein purpura, idiopathic thrombocytopenic purpura, Kawasaki disease, mixed connective tissue disease, juvenile dermatomyositis and Behcet’s disease.