CXCL8 and urolithiasis: Distribution of genotypes and alleles of the 597 A>G–IL-6 (rs1800797) and c.3331 G>A–IL-6 (rs2069845), c.+396 T>G–IL-8 (rs2227307), c.47 T>C (p.Val16Ala)–SOD2 (rs4880), c.1823 C>T (p.Ser608Leu)–NOS2 (rs2297518) and g.-1026 C>A–NOS2 (rs2779249) and ORs with 95% CIs in patients with urolithiasis and controls.