1. Echocardiography Laboratory; University Hospital Zurich; Zurich Switzerland
2. Department of Anesthesiology; University Hospital Zurich; Zurich Switzerland
3. Siemens Medical Solutions USA Inc.; Mountain View California
4. Andreas Grüntzig Cardiac Catheterization Laboratory; Cardiology; University Hospital Zurich; Zurich Switzerland
5. Department of Internal Medicine; University Hospital Zurich; Zurich Switzerland
6. Cardiovascular Surgery; University Hospital Zurich; Zurich Switzerland