PC and SC levels were analyzed using a SC immunoassay kit according to the specification of kits (Salimetrics LLC, State College, PA, USA). The value for intra- and inter-assay coefficient of variability (CV) of PC was 6.64% and 9.85%, respectively. The intra-assay and inter-assay CV values of SC were 8.84% and 9.13%, respectively. Plasma SP was analyzed using a substance P ELISA kit (Enzo Life Sciences, Farmingdale, NY, USA). The intra-assay CV was 8.42%, whereas the intra-assay CV was 10.6%. Plasma haptoglobin concentrations were analyzed using a bovine haptoglobin enzyme immunoassay kit (GenWay Biotech, San Diego, CA, USA). The intra- and inter-assay CV values were 1.46% and 8.67%, respectively. The analytical methods were verified in our previous study (Park et al [3 (link)]).
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