1. University Hospitals Harrington Heart and Vascular Institute, Cleveland, OH (M.H.S., V.S.K.).
2. University Heart Center Freiburg, Bad Krozingen, Germany (T.Z., U.B.).
3. Department of Angiology, Hanusch Hospital, Vienna, Austria (M.W.).
4. Medical University of Graz, Austria (M.B.).
5. Yale University School of Medicine, New Haven, CT (H.P., C.P., D.T., A.J.L.).
6. Auckland City Hospital, New Zealand (A.H.).
7. Arnsberg Vascular Center, Germany (M.L.).
8. Columbia University Irving Medical Center and Columbia University Vagelos College of Physicians and Surgeons, New York, NY (S.A.P.).
9. TriReme Medical, Pleasanton, CA (S.A.).
10. Icahn School of Medicine at Mount Sinai, New York, NY (P.K.).
11. Emory University, Atlanta, GA (K.A.N.).
12. Penn State Holy Spirit Hospital, Camp Hill, PA (A.U.W.).