1. Department of Cardiology, Massachusetts General Hospital, Boston, MA, USA
2. Department of Anesthesiology and Intensive Care Medicine, Aarhus University Hospital and Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
3. Department of Pulmonary Medicine and Critical Care, Massachusetts General Hospital, Boston, MA, USA
4. Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
5. Cardiovascular Performance Program, Massachusetts General Hospital, Boston, MA, USA
6. Echocardiography Laboratory, Massachusetts General Hospital, Boston, MA, USA