1. Harvard Medical School Boston Massachusetts USA
2. Division of Pulmonary and Critical Care Medicine Massachusetts General Hospital Boston Massachusetts USA
3. Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging Massachusetts General Hospital Boston Massachusetts USA
4. Institute for Innovation in Imaging Massachusetts General Hospital Boston Massachusetts USA
5. Division of Cardiovascular Medicine Brigham and Women's Hospital Boston Massachusetts USA
6. Department of Medicine University of Maryland School of Medicine Baltimore Maryland USA