IL15 and juvenile idiopathic arthritis: The following cytokines were not reported in JIA-TMJ serum and controls-serum due to more than 60% of the samples were below the limit of detection: IL-1ra, IL-1b, IL-2, IL-5, IL-6, IL-7, IL-10, IL-12, IL-15, GM-CSF, IFN γ, FGF-basic, VEGF.