4. Hemodynamic stenosis of the common or external iliac artery on Color Duplex Scanning (CDS) (PSV ratio ≥ 2.5 or EDV ≥ 0.6 m/s) or on Magnetic Resonance Angiography (MRA) or Computed Tomography Angiography (CTA)(> 50% stenosis) or occlusion of the common or external iliac artery on CDS (PSV 0 m/s) or on MRA or CTA;