1. Division of Vascular Surgery, Department of Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas,
2. Department of Otolaryngology-Head & Neck Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas
3. Division of Neuroradiology, Department of Radiology, University of Arkansas for Medical Sciences, Little Rock, Arkansas
4. Division of Vascular Surgery, Department of Surgery, University of Arkansas for Medical Sciences, Little Rock, Arkansas