1. Clinic for Cardiology, Herz- und Diabeteszentrum Nordrhein-Westfalen; Ruhr-Universität Bochum; Bad Oeynhausen Germany
2. ZNA Middelheim; Antwerpen Belgium
3. The Heart Hospital Baylor; Plano Texas USA
4. Texas Cardiac Arrhythmia Institute at St. David's Medical Center; Austin Texas USA
5. Stereotaxis, Inc; St. Louis Missouri USA
6. Central Baptist Hospital; Lexington Kentucky USA