1. Division of Cardiology; The University of Texas Health at San Antonio; San Antonio Texas
2. Department of Angiology; Universitäts Herzzentrum Freiburg Bad Krozingen; Bad Krozingen Germany
3. Swiss Cardiovascular Center, Division of Angiology; University Hospital, Inselspital; Bern Switzerland
4. Department of Angiology; University Hospital Leipzig; Leipzig Germany
5. Prairie Heart Institute at St John's Hospital; Springfield Illinois
6. Harrington Heart & Vascular Institute; University Hospitals of Cleveland; Cleveland Ohio