 - Patients with aortoiliac disease that limits inflow in either leg: a. Patients with concomitant aortoiliac disease i.e., patients with a significant component of inflow disease in the distal aorta, common or external iliac, or proximal common femoral artery as assessed by an imaging modality e.g., segmental limb pressures and waveform analysis, duplex ultrasound scanning, magnetic resonance angiography, or radio-contrast arteriogram performed within 1 year prior to Enrollment. If subject has had a bypass after the imaging study, then documentation of graft patency is required within 6 months prior to Enrollment; b. If it is suspected at Screening that a patient has aortoiliac disease based on vascular examination, an imaging modality e.g., segmental limb pressures and waveform analysis, duplex ultrasound scanning, magnetic resonance angiography, or radio-contrast arteriogram must be performed to rule it out if there is not one available within the times specified above. If there is no suspicion of aortoiliac disease in the Principal Investigators judgment, an imaging test at Screening is not required for study purposes. 