1. Columbia University College of Physicians and Surgeons, New York, New York
2. Southlake Regional Health Centre, Newmarket, Ontario, Canada
3. Lankenau Institute for Medical Research, Wynnewood, Pennsylvania
4. Mount Sinai Medical Center, New York, New York
5. Mayo Clinic College of Medicine, Rochester, Minnesota
6. Clinic for Cardiology and Pneumology, University Medicine Göttingen, Göttingen, Germany
7. Medtronic, Minneapolis, Minnesota