1. Harvard Medical School, Boston, MA, USA
2. University of Minnesota Medical School, Minneapolis, MN, USA
3. Stanford University School of Medicine, Palo Alto, CA, USA
4. Mount Sinai School of Medicine, New York, NY, USA
5. Vascular Ultrasound Core Laboratory, Morristown, NJ, USA
6. Mayo Clinic, Rochester, MN, USA
7. Mount Sinai School of Medicine, New York, NY, USA,