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Comparison of secreted interleukin-1β levels in individuals with chronic tension-type headache (CTTH) and healthy control individuals. Serum cytokine levels as measured by cytometric bead array (A) and ELISA (B) in CTTH individuals (grey) and healthy control individuals (white). *Cytokine bead array, P=0.04; ***ELISA, P<0.001. Conc Concentration
