1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
2. Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts 02124, United States
3. Athinoula A. Martinos Center for Biomedical Imaging, The Institute for Innovation in Imaging, Massachusetts General Hospital and Harvard Medical School, 149 Thirteenth Street, Charlestown, Massachusetts 02129, United States
4. Department of Thoracic Surgery, Massachusetts General Hospital, Boston, Massachusetts 02124, United States