1. Division of Vascular Surgery, Stanford University School of Medicine, Standford, CA (S.A.).
2. Section of Vascular Surgery, Surgical Service Line, Palo Alto VA Healthcare System, Palo Alto, CA (S.A.).
3. Division of Cardiovascular Diseases, Section of Interventional Cardiology, University of Iowa Carver College of Medicine, Iowa City, IA (S.G.).