1. Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina;
2. Division of Cardiology, Duke University Medical Center, Durham, North Carolina;
3. Department of Neurology, Duke University Medical Center, Durham, North Carolina;
4. Division of Cardiology, Advocate Heart Institute, Naperville, Illinois;
5. Department of Cardiology, Centre for Heart Disease, 4th Military Hospital, Wroclaw, Poland;
6. Division of Cardiology, Department of Medicine, The Ohio State University, Columbus, Ohio;
7. Department of Cardiology, Medical University, Military Hospital, Wroclaw, Poland;
8. Respicardia, Inc., Minnetonka, Minnesota