1 Dr. William M. Scholl College of Podiatric Medicine's Center for Lower Extremity Ambulatory Research (CLEAR) at Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL 60064.
2 Division of Vascular and Endovascular Surgery, Baylor College of Medicine, 7200 Cambridge Street, Houston, TX 77030.
3 Division of Vascular and Endovascular Surgery, Department of Surgery, University of California, San Francisco, 400 Parnassus Avenue, A-581, San Francisco, CA 94143.
4 Department of Plastic and Reconstructive Surgery, MedStar Georgetown University Hospital, 110 Irving Street NW, Suite 6A-126, Washington DC 20010.
5 Department of Surgery, Keck School of Medicine of University of Southern California, 1510 San Pablo St, Health Sciences Campus, Los Angeles, CA 90033.