Cytokine levels in peritoneal fluid samples were determined by ELISA using the commercially available human Quantikine kits from R&D Systems (Minneapolis, MN). The assays were performed in duplicate according to the manufacturer’s protocols. The detection threshold was 1.1 ng/ml for CCL18. The intra-assay variability was 3.2–3.7 % for CCL18. The inter-assay variability was 3.5 %. All samples were examined in duplicate and the median values were used for statistical analysis.
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