1. Yale University School of Medicine, New Haven, CT, USA
2. Charite Campus Benjamin Franklin, Berlin, Germany
3. Osperdali Riuniti di Bergamo, Bergamo, Italy
4. Silesian Center for Heart Disease, Lodz, Poland
5. LeBauer Cardiovascular Research Foundation and Moses Cone Hospital, Greensboro, NC, USA
6. Columbia University Medical Center and the Cardiovascular Research Foundation, New York, NY, USA