1. Department of Radiology, Division of Thoracic Imaging and Intervention, Massachusetts General Hospital, 55 Fruit St, FND-202, Boston, MA 02114
2. Department of Radiology, Ludwig-Maximilians-University, Munich, Germany
3. Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Boston, MA
4. Division of Mathematics and Science, Babson College, Wellesley, MA
5. Sloan School of Management, Massachusetts Institute of Technology, Cambridge, MA