1. Beth Israel Deaconess Medical Center/Harvard School of Medicine Boston MA USA
2. Detroit Medical Center Detroit Heart Hospital Wayne State University Detroit MI USA
3. Center for the Diagnosis and Treatment of Pericardial Disease Cleveland Clinic Cleveland OH USA
4. MedStar Washington Hospital Center Washington DC USA
5. Harrington Heart & Vascular Institute University Hospitals Cleveland Medical Center Cleveland OH USA
6. Cardiovascular and Thoracic Department and Department of Medical Sciences University Cardiology Torino Italy