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Comparison of secreted cytokine levels in chronic tension-type headache (CTTH) individuals and healthy controls. Serum cytokine levels as measured by cytometric bead array in CTTH individuals (grey) and healthy control individuals (white) (P>0.05). Conc Concentration; IFN-g Interferon-gamma; IL Interleukin; TNF-a Tumour necrosis factor-alpha
