aDepartment of Surgery, State University of New York (SUNY), Buffalo, NYbDepartment Dermatology, Rheinische Friedrich-Wilhelms-University, Bonn, GermanycSouthern Illinois University, Springfield, IlldDepartment of Surgery, Duke University Medical Center, Durham, NCeUniversity of North Carolina School of Medicine, Chapel Hill, NCfDivision of Vascular Surgery, Universtiy of Rochester, School of Medicine and Dentistry, Rochester, NYgUniversty of Washington, Seattle, WashhUniversity of Colorado School of Medicine, Aurora, Colo