CXCL8 and post-thrombotic syndrome: ↑ 182 recurrent VTE vs. 350 controls (52, 59) ↔ 181 cases vs. 313 controls (50) ↑43 DVT vs. 43 controls (57) correlation between baseline lumen diameter of the femoral thrombi and IL-8 cytokine (60) ↔ risk for post-thrombotic syndrome, 387 DVT (55)