1. The Ohio State University Wexner Medical CenterColumbus Ohio
2. Advocate Heart InstituteChicago Illinois
3. Respicardia IncMinnetonka Minnesota
4. Klinikum BielefeldBielefeld Delaware
5. Ruhruniversität BochumBad Oeynhausen Delaware
6. Department of Cardiology, University of Missouri‐Kansas City School of MedicineSaint Luke's Mid‐America Heart InstituteKansas City Missouri
7. Washington University School of MedicineSt Louis Missouri
8. United Heart and Vascular ClinicSt Paul Minnesota
9. Novant Health CardiologyWinston‐Salem North Carolina
10. Bryan Medical CenterLincoln Nebraska
11. Marshfield ClinicMarshfield Wisconsin
12. Heart Center Brandenburg in Bernau/Berlin & Brandenburg Medical SchoolBernau Delaware
13. University of Arizona College of MedicineTucson Arizona
14. 4th Military HospitalWroclaw Poland