“…Cytokine levels were investigated with ELISA in twelve studies [11-14,19,23-25,28,30,31,34], with bead-based immunoassays in five studies [17,20,26,29,33], with FACS analysis in two studies [10,21], with quantitative real-time PCR in one study [30], with reverse transcription PCR in one study [27], with immunohistochemistry in one study [15]. …”